Pls help I'm a little confused on this bc we just started it today tbh so if someone explains how they got the answers as well I'll be very thankful

Answer: [tex]-1 +\sqrt{7} i[/tex]    and    [tex]-1 -\sqrt{7} i[/tex]

Step-by-step explanation:

[tex]x^2 + 2x +8 = 0[/tex]

We cant factor. so use the quadratic formula and get:

[tex]x = \frac{-2 + \sqrt{-28} }{2}[/tex]        and        [tex]x = \frac{-2 - \sqrt{-28} }{2}[/tex]

these can be simplified to:

[tex]-1 +\sqrt{7} i[/tex]          and            [tex]-1 -\sqrt{7} i[/tex]

and thats it!

The measurement of the angle MRX is 130°.

Given that a figure we need to find the angle MRX,

The lines TP and ZX are perpendicular to each other, and there is a line MQ intersecting at R,

So,

Angles MRT and MRZ are complementary so,

m ∠MRZ + m ∠MRT = 90°

50° + m ∠MRT = 90°

m ∠MRT = 40°

Also,

Angles TRX and TRZ are supplementary so, and equal to right angle, so,

m ∠MRX = m ∠MRT + m ∠TRX

m ∠MRX = 90° + 40°

m ∠MRX = 130°

Hence the measurement of the angle MRX is 130°.

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96% percentage is the difference between 17/100 x 20 and 17/20 x 100

The difference between (17/100) x 20 and (17/20) x 100 can be calculated by finding the absolute difference between the two values and expressing it as a percentage of the larger value.

First, let's calculate each expression:

(17/100) x 20 = 0.17 x 20 = 3.4

(17/20) x 100 = 0.85 x 100 = 85

The difference between these two values is |85 - 3.4| = 81.6.

To express this difference as a percentage of the larger value, we divide 81.6 by the larger value (85 in this case) and multiply by 100:

(81.6 / 85) x 100 = 96%

Therefore, the difference between (17/100) x 20 and (17/20) x 100 is approximately 96% of the larger value.

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The fraction that represents a repeating decimal when converted is given as follows:

2/11.

A fraction is represented by the division of a term x by a term y, such as in the equation presented as follows:

Fraction = x/y.

The terms that represent x and y are listed as follows:

The decimal representation of each fraction is given by the division of the numerator by the denominator, hence:

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The statement "arcsin(sin(x)) = x for all x" is incorrect.

While it is true that for certain values of x, arcsin(sin(x)) equals x, it is not true for all values of x.

We have,

The range of the arcsin function is restricted to the interval [-π/2, π/2]. This means that the output of arcsin(x) will always be within this range.

However, the sin function has a periodic nature, oscillating between -1 and 1 as x increases.

For x values outside the interval [-π/2, π/2], the arcsin(sin(x)) expression will not yield x.

Instead, it will return a value within the range [-π/2, π/2] that has the same sine value as x.

To illustrate this, consider x = π/2 + ε, where ε is a small positive number.

In this case, sin(x) will still be equal to 1, but the arcsin(1) is

π/2, not π/2 + ε.

Therefore, the equation arcsin(sin(x)) = x does not hold for all values of x.

Thus,

The statement is only correct when x is within the interval [-π/2, π/2].

The range of arcsin(x) is restricted to this interval because sin(x) is bounded between -1 and 1 over this interval.

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Answer:

Step-by-step explanation:

True.

An enumerator is a special data type in some programming languages that allows us to give names to integer values, making the code more readable and easier to maintain.

However, an enumerator cannot be directly assigned to an int variable because they are not compatible data types. An int variable can only store integer values, while an enumerator is a named constant that represents an integer value.

To assign an enumerator to an int variable, we need to explicitly cast the enumerator to an int using type conversion.

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We can see that Savings Account 1 offers a slightly higher interest rate but compounds less frequently compared to Savings Account 2. The choice between the two accounts would depend on an individual's preferences and financial goals.

Based on the information provided in the table, we can complete the statement as follows:

"Savings Account 1 offers an interest rate of 2.25% compounded semiannually, with a minimum deposit requirement of $500. On the other hand, Savings Account 2 offers an interest rate of 2.20% compounded quarterly, also requiring a minimum deposit of $500."

The interest rate represents the annual percentage rate (APR) that the account offers. For Savings Account 1, the interest rate is 2.25%, meaning that for every $100 in the account, it will earn $2.25 in interest over the course of a year. This interest is compounded semiannually, meaning it is added to the account balance twice a year.

In contrast, Savings Account 2 offers an interest rate of 2.20%, slightly lower than the first account. However, the interest is compounded more frequently, on a quarterly basis. This means that the interest is added to the account balance four times a year.

Both accounts have the same minimum deposit requirement of $500, indicating that to open either account, a minimum of $500 must be deposited.

Overall, when comparing the two accounts, we can see that Savings Account 1 offers a slightly higher interest rate but compounds less frequently compared to Savings Account 2. The choice between the two accounts would depend on an individual's preferences and financial goals.

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Answer:

Which comparison is correct?

Ans 7<|7|

Step-by-step explanation:

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Consider the space [tex]C([0, 1])[/tex]of real-valued continuous functions on [0, 1] endowed with the sup-norm (or uniform norm[tex]) ∥ · ∥[infinity]. Let the set B ⊂ C([0, 1]) be B = {f ∈ C([0, 1]) | 0 ≤ f(x) ≤ 2, ∀ x ∈ [0, 1]} .[/tex]

Show that B is closed and bounded (with respect to the sup-norm).Since we are working with the sup-norm,[tex]|| · ||[infinity],[/tex] then we have the following: Suppose that B is not bounded. Then, for each integer n ≥ 1, there exists [tex]fₙ ∈ B[/tex] such that[tex]||fₙ||[infinity] > n[/tex]. In particular, for each n ≥ 1, there exists[tex]xₙ ∈ [0, 1][/tex] such that [tex]|fₙ(xₙ)| > n[/tex]. Define [tex]gₙ(x) = fₙ(x)/n[/tex]. Then [tex]gₙ ∈ B, but ||gₙ||[infinity] > 1,[/tex] which contradicts the definition of B. Hence, B is bounded. Let {fₙ} be a sequence of functions in B that converges to f ∈ C([0, 1]). We need to show that f ∈ B. Since {fₙ} converges to f uniformly on [0, 1], it follows that f is continuous.

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The three side (SSS) rule, two side and one angle (SAS) rule, and double angle (AA) rule have been determined.

What is three side (SSS) rule?

The SSS Congruence Rule,

Theorem states that two triangles are congruent if the three sides of one triangle are equal to the corresponding three sides (SSS) of the other triangle.

What is two side and one angle (SAS) rule?

The SAS Congruency,

When two sides and an included angle of one triangle are equal to the sides and an included angle of the other, two triangles are said to be congruent, or to have SAS congruency.

What is double angle (AA) rule?

Two triangles are comparable if two pairs of corresponding angles in each triangle are congruent. The Angle Sum Theorem can be used to demonstrate that all three pairs of corresponding angles are congruent if two pairs of corresponding angles are congruent.

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Expression C (4,480 * 1.008x) cannot be used to determine Marissa's net proceeds because it does not consider the broker fee or the online broker fee, which should be deducted from the final proceeds.

Let's evaluate each expression to determine which one cannot be used to determine Marissa's net proceeds.

A. 4,500 * 1.008x - 20

This expression represents the final proceeds after deducting the broker fee of 0.8% (0.008) and the online broker fee of $20. It correctly calculates the net proceeds and can be used.

B. 4,500 - (0.08x + 20 + x)

This expression subtracts various fees (broker fee and online broker fee) and the initial investment amount from the final stock price. It correctly calculates the net proceeds and can be used.

C. 4,480 * 1.008x

This expression multiplies the stock price before deducting any fees by the investment amount. However, it does not account for the broker fee or the online broker fee, which should be subtracted from the final proceeds. Therefore, this expression cannot be used to determine Marissa's net proceeds.

D. 4,500 * (1.008x + 20)

This expression multiplies the stock price after deducting the online broker fee by the investment amount and the broker fee. It correctly calculates the net proceeds and can be used.

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Complete Question:

Marissa purchased x dollars worth of stock and paid her broker a 0.8% fee. She sold the stock when the stock price increased to $4,500 using an online broker that charged $20 per trade.

Which expression below cannot be used to determine her net proceeds?

A. 4,500 1.008x-20

B. 4,500-(0.08x+20+x)

C. 4,4801.008x

D. 4,500 (1.008x+20)

Therefore, the sum of the distances traveled by the tips of both hands in one $24$-hour period is approximately $15.708$ meters.

To start, we need to find the length of each hand. The minute hand measures $10$ cm, which is equivalent to $0.1$ meters, and the hour hand measures $5$ cm, or $0.05$ meters.
Now, let's consider the distance each hand travels in one hour. The minute hand travels the circumference of the clock face, which has a diameter of $20$ cm or $0.2$ meters. The formula for the circumference of a circle is $2\pi r$, so the distance traveled by the minute hand in one hour is $2\pi(0.1) = 0.2\pi$ meters.
The hour hand travels the circumference of a circle with a diameter of $10$ cm or $0.1$ meters. Since the hour hand takes $12$ hours to complete one full revolution around the clock face, it travels $\frac{1}{12}$ of the circumference in one hour. Therefore, the distance traveled by the hour hand in one hour is $\frac{1}{12} \cdot 2\pi(0.05) = \frac{\pi}{120}$ meters.
To find the total distance traveled by both hands in $24$ hours, we can add up the distance traveled by each hand in one hour and multiply by $24$.
Total distance = $24\left(0.2\pi + \frac{\pi}{120}\right) \approx 15.708$ meters
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Choose to invest rather than depend only on savings is an investment account has the potential to earn more money than a savings account. B.

Investing offers the potential for higher returns compared to savings accounts typically provide lower interest rates.

By investing in various assets such as stocks, bonds or real estate, individuals have the opportunity to grow their wealth and achieve higher long-term returns.

Investing carries inherent risks, it also provides the possibility of generating significant gains and beating inflation over time.

On the other hand, savings accounts are generally considered low-risk and provide a safe place to store money.

The interest earned on savings accounts may not keep pace with inflation, potentially leading to a decrease in purchasing power over time.

choosing to invest rather than depend solely on savings can offer the advantage of potentially earning higher returns and achieving long-term financial goals.

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Answer:

V = 2458.10 cubic inches

Step-by-step explanation:

The solution is then[tex]: y(x) = a0 + a1x - 3a2x²/2! + ∑k=3∞akxk[/tex]For r = 1, the recurrence relation is:ak+2 = -ak/[(k+3)(k+2)]. The solution is then: y(x) = a0x + a1x²/2 - a3x4/4! + ∑k=4∞akxkThe solution obtained by both methods is of the form: y(x) = ERCrx.

The differential equation given is: x?y" + xy' + (32 - 4)y = 0Solve the following using a power series of the form y = ERCr&n+2.x.To solve this differential equation using the power series method, we will first assume the solution as a power series:y(x) = ERCrx = ∑n=0∞anxn+rAnd we differentiate it to get:y'(x) = ∑n=0∞an(n+r)xn+r-1y''(x) = ∑n=0∞an(n+r)(n+r-1)xn+r-2Now, we substitute the power series and its derivatives into the differential equation and collect the coefficients of the like terms.x?y" + xy' + (32 - 4)y = 0 x²∑n=0∞an(n+r)(n+r-1)xn+r-2+x∑n=0∞an(n+r)xn+r-1+(32-4)∑n=0∞anxn+r = 0xr-2∑n=0∞an(n+r)(n+r-1)xn+xr-1∑n=0∞an(n+r)xn+(32-4)∑n=0∞anxn+r = 0Now, we change the summation index by introducing a new variable k = n+r-2.

The new summation index starts from k = 0 when n = [tex]2-r.xr-2∑k=0∞ak-2+r(k+r)(k+r-1)xk+xr-1∑k=1∞ak-1+r(k+r-1)xk+(32-4)∑k=0∞ak+rxk+r = 0xr-2∑k=0∞ak+r\color{red}{-2+r}\normalsize(k+r)\color{red}{(k+r-1)}\normalsize xk+xr-1∑k=1∞ak\color{red}{-1+r}\normalsize(k+r-1)xk+(32-4)∑k=0∞ak+rxk+r = 0[/tex]Now, we have two summation terms that start from k = 0, which we will combine to get:[tex]xr-2[arr(r-1)x0 + ar+1(r+1)r x1 + ∑k=2∞ak+r\color{red}{-2+r}\normalsize(k+r)(k+r-1)xk] + xr-1[arr x0 + ∑k=1∞ak\color{red}{-1+r}\normalsize(k+r-1)xk] + (32-4)∑k=0∞ak+rxk+r = 0xr-2[arr(r-1)x0 + ar+1(r+1)r x1 + ∑k=2∞ak+r\color{red}{-2+r}\normalsize(k+r)(k+r-1)xk] + xr-1[arr x0 + ∑k=1∞ak\color{red}{-1+r}\normalsize(k+r-1)xk] + 28∑k=0∞ak+r\color{red}{+2}\normalsizexk+2 = 0[/tex]For the series to vanish for all x, the coefficient of each power of x must be zero. Hence, we get the following equations after equating the coefficients.[tex]arr(r-1) = 0ar+1(r+1)r = 0ak+r-2+r(k+r)(k+r-1) + ak-1+r(k+r-1) = 0 for k ≥ 2arr + ak-1+r(k+r-1) = 0 for k ≥ 1For the power series to converge, we must have ar ≠ 0[/tex]. From the first equation, we can have r = 0 or r = 1. For r = 0, the second equation implies a1 = 0. For r = 1, the second equation implies a2 = 0.Using the third and fourth equations, we can get the coefficients recursively. For r = 0, the recurrence relation is:ak+2 = -3ak/[(k+2)(k+1)]

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The inverse function of C(U) = U + 15 is U(C) = C - 15, representing the uncurved grade in terms of the curved grade. The correct option is OD. U(C) = C - 15.

To find the inverse function of C(U) = U + 15, we need to switch the roles of U and C and solve for U.

Let's denote the inverse function as U(C).

C = U + 15

To find U, we subtract 15 from both sides:

C - 15 = U

Therefore, the inverse function is U(C) = C - 15.

Among the given options, the correct inverse function is OD. U(C) = C - 15.

This inverse function represents the uncurved grade (U) in terms of the curved grade (C). It allows us to determine the original uncurved grade when we know the curved grade after applying a curve of adding 15.

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Every prime number is either in the form 4k + 1 or 4k + 3, where k is a positive integer

To show that every prime is either in the form 4k + 1 or 4k + 3, where k is a positive integer, we can use a proof by contradiction.

Assume that there exists a prime number p which is not of the form 4k + 1 or 4k + 3. This means p is not congruent to 1 or 3 modulo 4.

We consider two cases:

Case 1: p is congruent to 0 modulo 4.

If p is divisible by 4, then p can be written as p = 4m for some positive integer m. However, p is not prime if it is divisible by 4, so this case is not possible.

Case 2: p is congruent to 2 modulo 4.

If p is congruent to 2 modulo 4, then p can be written as p = 4m + 2 for some positive integer m. We can simplify this expression as p = 2(2m + 1). Here, p is divisible by 2 but not by 4, so p is not prime. Therefore, this case is also not possible.

Since both cases lead to contradictions, our assumption that there exists a prime number p not of the form 4k + 1 or 4k + 3 must be false.

Hence, every prime number is either in the form 4k + 1 or 4k + 3, where k is a positive integer.

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The equation of this circle in standard form is: D. (x - 4)² + (y - 1)² = 25.

In Geometry, the standard form of the equation of a circle is modeled by this mathematical equation;

(x - h)² + (y - k)² = r²

Where:

From the information provided above, we have the following equation of a circle:

x² - 8x + y² - 2y - 8 = 0

x² - 8x + y² - 2y = 8

x² - 8x + (-8/2)² + y² - 2y + (-2/2)² = 8 + (-8/2)² + (-2/2)²

x² - 8x + 16 + y² - 2y + 1 = 8 + 16 + 1

(x - 4)² + (y - 1)² = 25

(x - 4)² + (y - 1)² = 25

Therefore, the center (h, k) is (4, 1) and the radius is equal to 5 units.

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Answer:

y = x - 5

Step-by-step explanation:

x is input

y is output

output, y, is 5 less than input, x

y = x - 5

the probability that there is at most one purple marble when three marbles are randomly chosen from the bag is approximately 0.770.

To find the probability that there is at most one purple marble when three marbles are randomly chosen from the bag, we need to consider the different scenarios:

Scenario 1: No purple marbles are chosen

In this case, we can choose 3 marbles from the remaining yellow, green, and red marbles. The number of ways to choose 3 marbles from a set of 22 marbles (8 yellow + 9 green + 5 red) is given by the combination formula: C(22, 3).

Scenario 2: One purple marble is chosen

In this case, we need to choose 2 marbles from the remaining yellow, green, and red marbles, and 1 marble from the 3 purple marbles. The number of ways to choose 2 marbles from 22 marbles and 1 marble from 3 marbles is given by the combination formula: C(22, 2) * C(3, 1).

The total number of ways to choose 3 marbles from the 25 marbles in the bag (8 yellow + 9 green + 3 purple + 5 red) is given by: C(25, 3).

To find the probability, we sum the probabilities of both scenarios and divide by the total number of ways to choose 3 marbles:

Probability = (Number of ways for scenario 1 + Number of ways for scenario 2) / Total number of ways

Probability = (C(22, 3) + (C(22, 2) * C(3, 1))) / C(25, 3)

Using a calculator or computer program to calculate the combinations, we can find:

Probability ≈ 0.770

Therefore, the probability that there is at most one purple marble when three marbles are randomly chosen from the bag is approximately 0.770.

The correct answer is 0.770, corresponding to option 0.770.

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A normality test is run as part of every experiment, to find out if a sample data comes from a normally distributed population. It is essential to determine whether a sample data comes from a normal distribution before performing any statistical analysis on it.

Normality tests are important because many statistical tests, including the t-test and the analysis of variance (ANOVA), depend on the assumption of normality. If the data are not normally distributed, the results of the analysis may be incorrect, leading to wrong conclusions. Normality tests are used to determine whether the data is normally distributed or not. The most commonly used normality tests are the Shapiro-Wilk test, the Anderson-Darling test, the Kolmogorov-Smirnov test, and the Lilliefors test.

If the p-value is less than or equal to the level of significance, then the null hypothesis is rejected, which means that the data is not normally distributed. In conclusion, a normality test should be run as part of every experiment to check the normality of the data. If the data are not normally distributed, then the results of the analysis may be incorrect, leading to wrong conclusions. Therefore, normality tests are essential for ensuring the validity of the statistical analysis.

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The given statement "context switching is required by all preemptive algorithms " is False.

Context switching is not required by all preemptive algorithms. Preemptive algorithms allow the operating system to interrupt the currently executing process and switch to another process.

Context switching involves saving the state of the currently running process and restoring the state of the next process to be executed. While context switching is a common mechanism in preemptive scheduling algorithms, there are non-preemptive algorithms that do not require context switching as they allow processes to run until they voluntarily release the CPU.

So, the statement that context switching is required by all preemptive algorithms is false.

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Answer:

There are a total of 10 + 15 + 25 = 50 marbles in the bag, and 10 of them are red. Therefore, the probability of Tammy selecting a red marble on any given draw is 10/50 = 1/5.

Since Tammy is returning the marble to the bag after each draw, the probability of selecting a red marble on any given draw remains the same. This means that each of the 90 draws is an independent event with a probability of 1/5 of selecting a red marble.

To find the expected number of times Tammy will select a red marble in 90 draws, we can use the formula:

Expected number of red marbles = Total number of draws x Probability of selecting a red marble on any given draw

Expected number of red marbles = 90 x 1/5

Expected number of red marbles = 18

Therefore, Tammy can expect to pull out a red marble approximately 18 times in 90 draws.

When the 2.00 g sample of ice at 0.0°C is placed in the 50.0 g of water initially at 25.0°C in an insulated container, heat transfer occurs between the ice and water until they reach thermal equilibrium.

The heat transfer process involves the ice absorbing heat energy from the water, causing the ice to melt and the water to cool down. This is due to the ice having a lower temperature than the water. During the heat transfer, the ice absorbs heat from the water, causing its temperature to rise and reach its melting point of 0.0°C. Once the ice has completely melted, the water and ice mixture will be at a uniform temperature of 0.0°C.

Since the container is insulated, it prevents any heat exchange with the surroundings, ensuring that the system remains closed and the heat transfer occurs only between the ice and water. Overall, the system reaches a final equilibrium state where all the ice has melted, and the final temperature of the water-ice mixture is 0.0°C.

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This is the polar equation for the curve represented by the Cartesian equation xy = 1.

To find the polar equation for the curve represented by the Cartesian equation xy = 1, we can substitute the Cartesian coordinates with their equivalent polar coordinates.

In polar coordinates, x = r * cos(θ) and y = r * sin(θ).

Substituting these into the equation xy = 1:

(r * cos(θ)) * (r * sin(θ)) = 1

Expanding and simplifying:

r² * cos(θ) * sin(θ) = 1

Since cos(θ) * sin(θ) is equal to (1/2) * sin(2θ), we can rewrite the equation as:

(r²/2) * sin(2θ) = 1

Dividing both sides by (r²/2), we get:

sin(2θ) = 2/r²

This is the polar equation for the curve represented by the Cartesian equation xy = 1.

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The statement that can be used to find the value of xy is D. cos m< x = xy/y. Explanation: Let us see what we are given and what we need to find.

Given: A xyz is a triangle with x = 20.5, y = 11.8, and[tex]m < x = 55.4[/tex]°We need to find: Value of xy Step-by-step explanation: In a right triangle, the cosine of an angle is equal to the ratio of the adjacent side to the hypotenuse. [tex]cos m < x = xy/y cos 55.4 = xy/20.5xy = 20.5 × cos 55.4 = 20.5 × 0.5736 ≈[/tex]11.76Therefore, the value of xy is approximately 11.76.

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Suppose 60% of the area under the standard normal curve lies to the right of z. The value of z is greater than zero. This statement is True.

We know that the standard normal distribution is symmetric.

So, if we divide the area of the curve into two parts, each part will have 50% area. The standard normal distribution is shown below : Now, it is given that 60% of the area under the standard normal curve lies to the right of z. This implies that the remaining 40% area lies to the left of z. Therefore, z is negative because it lies to the left of the mean.

However, it is given that the value of z is greater than zero. This is not possible.

Hence, the given statement is false. However, if the statement was changed to say that 60% of the area lies to the left of z, then the statement would be true. This is because z is a positive value and it lies to the left of the mean.

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the first probability of having a dice land on 1 is 1 in 6 or 1/6. to find the probability of it happening 3 times we do (1/6)^3. (1/6)^3 is 1/216. but since it said exactly 3 doce landing on 1 we need to make sure the ladt isnt a 1 and the probability of that happening is 5/6. so to find the total probability of exactly 3 doce being 1 we do (1/216)*(5/6)=5/1296 or when rounded to 3 decimal places its 0.004. also pls mark as brainliest answer

The probability that the sample mean is greater than 168 is approximately 0.0655, or 6.6% (rounded to the nearest tenth of a percent).

To find the probability that the sample mean is greater than 168, we can use the central limit theorem and the properties of the normal distribution.

The central limit theorem states that for a large enough sample size (in this case, n = 50), the distribution of sample means will approach a normal distribution, regardless of the shape of the population distribution.

Given that the population mean is 164 and the population standard deviation is 18.65, we can calculate the standard deviation of the sample mean, also known as the standard error, using the formula:

Standard Error (SE) = Population Standard Deviation / √(Sample Size)

SE = 18.65 / √50

SE ≈ 2.636

Next, we need to standardize the value of 168 using the sample mean and the standard error. This allows us to calculate the probability using the standard normal distribution.

Z = (Sample Mean - Population Mean) / Standard Error

Z = (168 - 164) / 2.636

Z ≈ 1.516

To find the probability that the sample mean is greater than 168, we can look up the corresponding area under the standard normal curve to the right of Z = 1.516. This can be done using a standard normal distribution table or a statistical calculator.

Using a standard normal distribution table, we find that the area to the right of Z = 1.516 is approximately 0.0655.

Therefore, the probability that the sample mean is greater than 168 is approximately 0.0655, or 6.6% (rounded to the nearest tenth of a percent).

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