The most typical or average value among a group of numbers is called the mean. It is a statistical measure of a probability distribution's central tendency along the median and mode. It also goes by the name "anticipated value."
Steel rods are produced by a firm. The lengths of the steel rods have a mean of 140.9 cm and a standard deviation of 1 cm, and they are regularly distributed. 22 steel rods are packaged together for shipping. determine the likelihood that the average length of a bundle of steel rods chosen at random is less than 140.7 cm.
mean is N (M) (109,1.6)
Looking for P(M 108.7) to P(z ???) conversion utilizing N(0,1) z-statistic transformation
P(z [M - population mean]/[SD/square root(sample size)]) = P(z [108.7-109)/[1.6/sqrt(27)] = P(z -0.974] = 0.165.
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Could I please get help with this this problem, and find out their answers?
The image of triangles are given .
a.
[tex]\angle J\cong\angle E,\angle K\cong\angle G,\angle L\cong\angle F[/tex]b. Find the ratio,
[tex]\frac{EG}{JK}=\frac{15}{10}=\frac{3}{2}[/tex][tex]\frac{GF}{KL}=\frac{24}{16}=\frac{6}{4}=\frac{3}{2}[/tex][tex]\frac{EF}{GL}=\frac{21}{14}=\frac{3}{2}[/tex]c.Hence the triangles are similar .
[tex]\Delta\text{JKL}\cong\Delta\text{EGF}[/tex]The correct option is A.
4 2/15 / 3.1 (I NEED HELP NOW!!!!!!!!!!!)
Answer:
The answer would be 1.3, and the three is repeating.
Step-by-step explanation:
First, make 4 2/15 into a improper fraction.
4 2/15= 62/15
Now, when we divide fraction, use the rule Keep, Change, Flip.
Keep the 62/15.
Change the division sign into a multiplication sign.
To make the 3.1 into a fraction, put a one over it.
3.1/1
Now, flip the fraction.
3.1/1= 1/3.1
Your equation will look like this:
62/15x1/3.1
Multiply across.
62/46.5
Now simplify.
The answer would be 1.3, and the three is repeating.
[tex]11/16 - 2/3[/tex]11/16 - 2/3=
Sydney picked 28 raspberries and 35 blueberries to make two desserts.
She needs 4 raspberries for each raspberry tart and 5 blueberries for each
blueberry tart. She wants to know how many desserts she will be able to
make with the berries.
Please help me I only have 3 minutes left to do this
486lb of grass seed is required to cover the field on the right.
What is Area of Rectangle?The area of Rectangle is length times of width
Let us find the areas of two rectangle larger and smaller.
Area of the larger rectangle:
60×90=5400 square feet.
Now divide the larger square area by the smaller square area:
Area of the smaller rectangle
40×50=200 square feet.
Now divide larger rectangle with smaller
5400/200 =27
27 is the ratio of the difference
27×18=486 lb.
Hence 486lb of grass seed is required to cover the field on the right.
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suppose the number of hours of sleep students get per night has a unimodal and symmetric distribution with a mean of 7 hours and a standard deviation of 1.5 hours. approximately what percent of students sleep more than 8.5 hours per night?
Approximately 34% of people sleep more than 8.5 hours per night.
According to the Empirical Rule states for a normally distributed random variable: 68% of the measures are within 1 standard deviation of the mean, 95% of the measures are within 2 standard deviations of the mean and 99.7% of the measures are within 3 standard deviations of the mean. According to the question, Mean = 7 and Standard deviation = 1.5. Also, in the question the normal distribution is symmetric, which means that 50% of the measures are below the mean and the rest 50% are above the mean. Now, the mean is 7 and 8.5 is 1 one standard deviation above the mean. So, by the Empirical Rule, of the 50% of the measures that are above the mean, 68% are within 1 standard deviation of the mean (more than 8.5 hours). So, we get
0.5*0.68 = 0.34 which is equal to 34%.
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The largest y-value of the function is called thefunction.value of the
As the y-values of a function are the values that the function takes, the largest y-value of a function is called the maximum value of the function
Answer: maximumwhat is 17 = r - 6.7
Answer:
r = 23.7
Step-by-step explanation:
17 = r - 6.7 ( add 6.7 to both sides )
23.7 = r
Write the equation of the line that is perpendicular to the line y=3x+5 and passes through point (9,5)
The equation of the required perpendicular line is x + 3y = 24.
What is the slope relation for two perpendicular lines?
For two perpendicular lines on a plane, the product of their slopes always equals (-1).
What is the equation of line with slope 'm' and passing through the point (x₁, y₁)?
The standard equation of the line with slope 'm' and passing through the point (x₁, y₁) is y - y₁ = m(x - x₁).
Given, the required line is perpendicular to line given by y = 3x + 5 with slope, m₁ as 3, on analysis with standard equation of line; also the line passes through the point (9, 5) i.e. (x₁, y₁).
Let the slope of the required line be = m₂
As per statement established in the literature above, we have:
Slope of two perpendicular lines = -1
∴m₁ × m₂ = -1 ⇒ 3m₂ = -1 ⇒ m₂ = (-1)/3
Again, equation of the required perpendicular line is:
y - 5 = [(-1)/3][x - 9] ⇒ 3y - 15 = 9 - x ⇒ x + 3y = 24
Thus, the equation of the required perpendicular line is x + 3y = 24.
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Simplify the expression.
2/5y−4+7−9/10y =
Answer:
[tex]\frac{1}{2}[/tex] y +3
Step-by-step explanation:
You want to combine like terms
[tex]\frac{2}{5}[/tex] y and [tex]\frac{-9}{10}[/tex] y are like terms because they both have a variable y
-4 and + 7 are like terms because they are both constants. (numbers without letters)
We combine these
[tex]\frac{4}{10}[/tex] means the same as [tex]\frac{2}{5}[/tex] I just multiplied the numerator (top) and the denominator (bottom) by 2. I did this so that I could add it to [tex]\frac{-9}{10}[/tex]
[tex]\frac{4}{10}[/tex]y - [tex]\frac{9}{10}[/tex]y = [tex]\frac{-5}{10}[/tex] y (4-9 = -5) or [tex]\frac{-1}{2}[/tex] y simplified
-4 + 7 = 3
Suppose we are buying beans and rice to feed a large gathering of people, and we plan to spend $120 on the two ingredients. Beans cost $2 a pound and rice costs $0.50 a pound.
If x represents pounds of beans and y pounds of rice, the equation 22 + 0.50y = 120 can represent the constraints in this situation.
The line below shows the graph of this equation (ignore the points not on the line).
Please help me I would appreciate it so much
The true statements about the constraints in this situation are:
If we buy 30 pounds of beans we can buy with 120 pounds of rice.If we buy no beans we can buy 240 pounds of rice.If we buy 20 more pounds of rice, we would have to buy 5 less pounds of beans.How to determine the true statements?In order to determine the true statements, we would substitute the value of x and y into the given linear equation and then evaluate. From the information provided, the constraints in this situation are modeled or represented by this linear equation:
2x + 0.50y = 120
Where:
x represents pounds of beans.y represents pounds of rice.When x = 40 and y = 60, we have:
2x + 0.50y = 120
2(40) + 0.50(60) = 120
80 + 30 = 120
110 ≠ 120 (Not a solution).
When x = 30 and y = 120, we have:
2x + 0.50y = 120
2(30) + 0.50(120) = 120
60 + 60 = 120
120 = 120 (True solution).
Therefore, if we buy 30 pounds of beans we can buy with 120 pounds of rice.
When x = 0 and y = 240, we have:
2x + 0.50y = 120
2(0) + 0.50(240) = 120
0 + 120 = 120
120 = 120 (True solution).
Therefore, if we buy no beans we can buy 240 pounds of rice.
When x = 0 - 5 and y = 240 + 20, we have:
2x + 0.50y = 120
2(0 - 5) + 0.50(240 + 20) = 120
-10 + 130 = 120
120 = 120 (True solution).
Therefore, if we buy 20 more pounds of rice, we would have to buy 5 less pounds of beans.
When x = 0 + 10 and y = 240 - 60, we have:
2x + 0.50y = 120
2(0 + 10) + 0.50(240 - 60) = 120
20 + 90 = 120
110 = 120 (Not a solution).
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x-4y=-2
Determine if the given ordered pair, (2, 1), satisfies the given equation.
O YES
O NO
Answer:
Yes.
Step-by-step explanation:
Replace x with 2 and y with 1 and see if the equation is true
x - 4y = -2
2 - 4(1) = -2
2 - 4 = -2
-2 = -2
The statement is true so the point is on the line.
O is the center of the regular decagon below. Find its perimeter. Round to the nearest
tenth if necessary.
16
Based on the center of the regular decagon, we can find that the perimeter of the decagon would be 98.9 units.
How to find the perimeter of a decagon?When given the midpoint of a decagon and the measurement of the radius, the perimeter can be found by the formula:
= 10 x ( ( 2 x Radius of the decagon) / (1 + √5)))
Given a radius of 16 units, the perimeter of this decagon is:
= 10 x ( (2 x 16) / (1 + √5)))
= 10 x ( (32 / (1 + √5)))
= 98.9 units
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Perimeter of Decagon with radius and midpoint given is 100 units.
What is Polygon?Polygon can be defined as a flat or plane, two-dimensional closed shape bounded with straight sides.
Given polygon is a decagon. A decagon is a polygon which have ten sides with same length with centre o.
The radius of the decagon is 16.
When radius and midpoint is given the perimeter can be given by formula
Perimeter= 10 x ( ( 2 x Radius of the decagon) / (1 + √5)))
=10×((2×16) / (1 + √5)))
=10×((32) / (1 + √5)
=320/1+√5
=320/1+2.2
=320/3.2
=100 units.
Hence perimeter of Decagon with radius and midpoint given is 100 units.
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An aquarium has dimensions 2x feet, (x â€" 1) feet, and (x 2) feet. The aquarium volume must be no more than 280 cubic feet. What are the possible values of x? (1, 5) (1, 5] [1, 5) [1, 5]
The possible values of x that satisfies the given dimensions and the condition that the volume must be no more than 280 cubic feet is x = [1,5]
The dimensions of the aquarium is: 2x ft , (x -1) ft, and (x + 2) ft. Since the volume must be no more than 280 ft³, it means:
V = 2x (x - 1) (x + 2) ≤ 280
Divide both sides by 2:
x (x - 1) (x + 2) ≤ 140
x³ + x² - 2x - 140 ≤ 0
(x - 5) (x² + 6x + 28) ≤ 0
Since x² + 6x + 28 is always greater than zero then x that satisfies the above inequality is:
x - 5 ≤ 0
or x ≤ 5
Using the interval notation, x = (-∞, 5]
However, remember that the dimension is always a positive number.
Hence,
x - 1 ≥ 0
or x ≥ 1
Therefore, the solution is [1, 5]
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Find the y intercept: y=3.5x-7
The y-intercept of the function y = 3.5x - 7 is ( 0, - 7 ).
A function is an association between inputs in which each input has a unique link to one or more outputs. Each function has a range, codomain, and domain.
Consider the function,
y = 3.5x - 7
The equation of a straight line is expressed in the slope-intercept form (a linear function). It takes the formula y = mx + b, where m is the slope, b is the y-intercept, and y and x serve as variables.
The value of y at x = 0 can be used to determine the y-intercept. The graph's intersection with the y-axis occurs at this location.
Then,
y = 3.5x - 7
y = 3.5( 0 ) - 7
y = - 7
The y-intercept of the function is ( 0, - 7).
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Shelly was shopping and saw that a 14lb turkey costs $13.86. Calculate the unit price for 1 lb of turkey.
the unit price for 1 lb of turky is $0.99
Explanation:The cost of 14 lb of turkey = $13.86
let the cost of 1 lb of turkey = y
The unit price is the cost for 1lb of turkey:
14 lb = 13.86
1 lb = y
cross multiply:
14(y) = 1(13.86)
14y = 13.86
divide both sides by 14:
14y/14 = 13.86/14
y = 0.99
Hence, the unit price for 1 lb of turky is $0.99
provide an appropriate response. the length of time it takes college students to find a parking spot in the library parking lot follows a normal distribution with a mean of 7.0 minutes and a standard deviation of 1 minute. find the cut-off time which 75.8% of the college students exceed when trying to find a parking spot in the library parking lot.
By the distribution,6.3 minutes is the time limit that 75.8% of college students go over when looking for a parking space in the library parking lot.
Given that,
Finding a parking spot in the library parking lot takes college students an average of 7.0 minutes, with a standard deviation of 1 minute, according to a normal distribution.
Find the window of opportunity that 75.8% of college students miss when looking for a place in the library parking lot.
The following formula calculates the z-score of a measure X of a normally distributed variable with mean μ and standard deviationσ:
Z=(X-μ)/σ
The z-score calculates how far the measure deviates from the mean by standard deviation.
The p-value for this z-score, which is the percentile of X, can be obtained by looking at the z-score table.
The cut-off time is the 100th percentile minus 75.8th percentile, or X, for Z = -0.7, so:
Z=(X-μ)/σ
-0.7=(X-7)/1
-0.7=X-7
X=-0.7+7
X=6.3
Therefore, 6.3 minutes is the time limit that 75.8% of college students go over when looking for a parking space in the library parking lot.
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9TH GRADE MATH HELPPPP
Answer:
The equation in slope-intercept form is:
[tex]y=\frac{1}{3}x+3[/tex]
So the second option is the correct one.
Step-by-step explanation:
Step 1: Identify the gradient
The perpendicular line's equation is given as:
[tex]y=-3x+4[/tex]
This equation is in the form of:
[tex]y=mx+b[/tex]
Upon comparing the [tex]x[/tex] components of both equations, we get[tex]-3x=mx\\\text{Remove the}~ x~ \text{from both sides:}\\-3=m\\m=-3[/tex]
So, the gradient of this 'reference' equation is -3.
The equation we need to find is perpendicular to this 'reference' equation.
So, its gradient should be the negative reciprocal of the gradient of the 'reference' equation.
The negative reciprocal of -3 is:
[tex]-\frac{1}{(-3)}\\=\frac{1}{3}[/tex]
So, the gradient of our equation is [tex]\frac{1}{3}[/tex].
Step 2: Create the equation:
The equation crosses the x-axis at -9, which means its y-coordinate is 0 (at x-axis, y=0) ,so its coordinate is [tex](-9,0)[/tex].
The formula for an equation is:
[tex]y-y_{1}=m(x-x_{1})[/tex]
The coordinate [tex](x_{1},y_{1})[/tex] is [tex](-9,0)[/tex], and the gradient ([tex]m[/tex]) is [tex]\frac{1}{3}[/tex].
Substitute the values into the equation:
[tex]y-y_{1}=m(x-x_{1})\\y-0=\frac{1}{3}(x-(-9))\\\\\text{Simplify}\\y=\frac{1}{3}(x+9)[/tex]
[tex]\text{Simplify further}\\y=\frac{1}{3}x+3[/tex]
Since, the slope-intercept form is:
[tex]y=mx+b[/tex]
We already have our equation in the slope-intercept form.
A triangle has sides with lengths of 30 kilometers, 35 kilometers, and 45 kilometers. Is it a right triangle?
If a triangle has sides with lengths of 30 kilometers, 35 kilometers, and 45 kilometers. No it is not a right triangle.
Determining whether the triangle is a right triangleWe would be making use of converse of Pythagoras' theorem to determine whether the triangle is a right triangle.
In a situation were we have a right triangle the square on longest side will be the same with the sum of square of other sides
Longest side
45² = 2025
Other side
30 ² + 35 ²
900 + 1,225
= 2125
Hence,
2025 ≠ 2125
Based on the above it is not a right triangle because the longest side did not equate the other side.
Therefore it is not a right triangle.
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As 2125 ≠ 2025 therefore it didn't meet the requirements of Pythagoras' theorem, it is not a right-angle triangle.
This type of question makes a right-angled triangle that can be solved by Pythagoras's theorem.
What is Pythagoras's theorem?In a right-angled triangle, the sum of the squares of the smaller two sides of a right-angle triangle is equal to the square of the largest side.
Given, A triangle has sides with lengths of 30 kilometers, 35 kilometers, and 45 kilometers.
∴ 30² + 35² = 45².
900 + 1225 = 2025.
2125 ≠ 2025.
It is not a right-angle triangle because it didn't satisfy the property of Pythagoras's theorem.
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WILL GIVE BRAINLIEST!!! solve the problem fill in the blanks to show your work
By performing mathematical operations, the answer to the given expression (- 1.2(2/5) ÷ -2) is 0.24.
What are mathematical operations?An operation is a function in mathematics that transforms zero or more input values into a clearly defined output value. The operation's arity is determined by the number of operands. The four mathematical operations are functions that take input values, or numbers, and turn them into output values, or yet another number. They are multiplication, division, addition, and subtraction.So, the values in the blank will be:
= - 1.2(2/5) ÷ -2= -1.2(0.4) ÷ -2= - 0.48 ÷ -2= 0.24Therefore, by performing mathematical operations, the answer to the given expression (- 1.2(2/5) ÷ -2) is 0.24.
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the probability of being satisfied with a product purchased online is 0.555. if you buy 8 products online, what is the probability that you will be satisfied with 3 or more of the purchased products? (round your answer to 3 decimal places if necessary.)
The probability that you will be satisfied with 3 or more of the purchased products is 0.916
Given that,
The chance of being pleased with an internet purchase is 0.555. if you purchase 8 items online
Solution -
let X denote the no of success of
Purchased product online
X ~ B(n,p)
n = 8
P= 0. 555
a = 1 - 0 .555 = 0.445
P ( X = x) = [tex]nc_{x} b^{x} a^{n-x}[/tex]
P ( X = x)= [tex]8c_{x} (0.555^{x} )(0.445)^{8-x[/tex]
P ( X>=3)= [tex]\lim_{3 \to 8} 8c_{x} (0.555^{x} )(0.445)^{8-x[/tex]
P ( X>=3)) = 0.91614
=0.916
Therefore we can conclude the probability that you will be satisfied with 3 or more of the purchased products is 0.916
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3x+y-77=0
Can anyone help me with this question it would really help me out
the answer is in the photo I took of solving it
Given
\qquad \overline{BA}\perp\overline{BD}
BA
⊥
BD
start overline, B, A, end overline, \perp, start overline, B, D, end overline
\qquad m \angle CBD = 4x + 52^\circm∠CBD=4x+52
∘
m, angle, C, B, D, equals, 4, x, plus, 52, degrees
\qquad m \angle ABC = 8x - 10^\circm∠ABC=8x−10
∘
m, angle, A, B, C, equals, 8, x, minus, 10, degrees
Find m\angle CBDm∠CBDm, angle, C, B, D:
The value of ∠CBD is 68° and the value of ∠ABC is 22°
Given
Angle CBD = 4x + 52
Angle ABC = 8x − 10
If BA is perpendicular to BD, then ∠BAD = 90°
∠BAD = ∠CBD + ∠ABC
On substituting this values into the formula:
4x + 52 + 8x − 10 = 90
12x + 42 = 90
Add -42 to both sides
12x + 42 - 42 = 90 -42
12x = 48
x = 48/12
x = 4°
Here,
∠CBD = 4x + 52
∠CBD = 4 x 4 + 52 = 16 + 52 = 68°
Then,
∠ABC = 8x − 10
∠ABC = 8 x 4 − 10 = 32 - 10 = 22°
That is,
The value of ∠CBD is 68° and the value of ∠ABC is 22°
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Answer:
68 degrees
Step-by-step explanation:
got it right on khan academy
need this asap 50 points for it
Answer:
the subtraction property of equality
Step-by-step explanation:
trust
Answer:
Subtraction
Step-by-step explanation:
a group of friends is taking part in a two-day walking event for charity. yesterday, they walked 28 miles in 9 hours and 44 minutes. today, they finished the last 10 miles in 2 hours and 55 minutes. what was the group's average speed for the two-day event?
Average speed of the group for the two day event is 0.105 miles\min.
The average is defined as the mean value that is equal to the ratio of the total sum of the number of a given set of values to the total number of values present in that set.
Time taken on day 1 in minutes = 9x60 + 44
= 540 + 44 = 584 minutes.
Time taken on day 2 in minutes = 2x60 + 55
= 120 + 55 = 157 minutes
Now we will be applying speed-distance formula we get,
Speed= Distance/time
On day 1,
[tex]Speed_{1}[/tex]= 28/584 = 0.0479 miles/min
On day 2,
[tex]Speed_{2}[/tex]= 10/175 = 0.0571 miles/min
Thus,the average speed is:
Average = [tex]Speed_{1} + Speed_{2}[/tex] = 0.0479 + 0.0571= 0.105 miles/min
Hence,the average speed is 0.105 miles/min
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5. Which might be your first step if you want to solve the
system by elimination?
1st equation: 5x + 4y = 7
2nd equation: 2x - 3y = 3
A) Substitute -10y + 7 for x in the second equation.
B) Substitute 3y + 3 for x in the second equation.
C) Multiply the first equation by 3, multiply the second
equation by 4, then add the resulting equations
together.
D Multiply the first equation by 2, multiply the second
equation 5, then add the resulting equations together.
Answer:
C)
Step-by-step explanation:
elimination is not substitution.
therefore, A and B are out.
D does not work, because in the described way the x terms don't get different signs, and the addition does not eliminate any variable.
C brings both y terms to the same absolute value, and their signs are different, so the addition will eliminate the y terms leaving us with one equation in x that we can solve :
15x + 12y = 21
8x - 12y = 12
---------------------
23x 0 = 33
23x = 33
x = 33/23
Answer:
a is the right answer for you
Finding Slope
Help mee
Answer: The slope is [tex]\frac{2}{3}[/tex].
Step-by-step explanation:
[tex]Slope = \frac{y_{2} -y_{1} }{x_{2}-x_{1} } =\frac{-8-(-6)}{-2-1} =\frac{-2}{-3} =\frac{2}{3}[/tex]
Match each ratio to an equal ratio. Drag the items on the left to the correct location on the right.
Answer:
30
Step-by-step explanation:
it doesn't seem to be correct question
x=3
PLS BE DONE RIGHT AWAY, VERY APPRECIATED
The perimeter of a rectangle is to be between 140 and 220 inches. FindThe range of values for its length when its width is 20 inches
The lower value of the perimeter is 140 inches .
Width of the rectangle is 20 inches .
The length of the rectangle is calculated as ,
[tex]\begin{gathered} \text{Perimeter = 2 ( Length + width )} \\ 140=\text{ 2 ( Length + }20\text{ )} \end{gathered}[/tex]Rearranging the terms ,
[tex]\begin{gathered} \text{Length + 20 = }\frac{140}{2} \\ \text{Length + 20 = 70} \\ \text{Length = 50 inches} \end{gathered}[/tex]The higher value of perimeter is 220 inches .
Width of the rectangle is 20 inches .
The length is calculated as,
[tex]\begin{gathered} \text{Perimeter = 2 ( Length + width )} \\ 220=\text{ 2 ( Length + }20\text{ )} \end{gathered}[/tex]Therefore,
[tex]\begin{gathered} \text{Length + 20 = 110} \\ \text{Length = 110 - 20} \\ \text{Length = 90 inches} \end{gathered}[/tex]Thus the range of values for the length of the given rectangle are 50 and 90 .