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Allisa [31]
4 years ago
5

A study of one thousand teens found that the number of hours they spend on social networking sites each week is normally distrib

uted with a mean of 10 hours. The population standard deviation is 2 hours. What is the 95% confidence interval for the mean?
A) 9.88-10
B) 10-10.12
C) 9.88-10.12
D) 9.76-10.24
Mathematics
1 answer:
stepan [7]4 years ago
3 0
<span>The answer for the question above is C) 9.88-10.12</span>
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Write the slope-intercept form of the equation of the line with a slope of -9/4 that
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y=-3/7x +1/7

Step-by-step explanation:

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If f(x)=|3x-4|+2 find f(-10)
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f(-10)=36

Step-by-step explanation:

f(x)=|3x-4|+2\\f(-10)=|3(-10)-4|+2\\f(-10)=|-30-4|+2\\f(-10)=|-34|+2\\f(-10)=34+2\\f(-10)=36

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the ratio of sadia's age to her father's age is 3:6. The sum of their age is 96 .What is sadia's age​
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We have,

a:b=3:6,a+b=96

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3 years ago
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One gallon of paint covers 400 square feet of surface area. A typical spherical water tower holds 66,840.28 cubic feet of water.
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Answer: There will enough to paint the outside of a typical spherical water tower.


Step-by-step explanation:

1. Solve for the radius r from the formula for calculate the volume of a sphere. as following:

V=\frac{4}{3}r^{3}\pi\\\frac{3V}{4\pi}=r^{3}\\r=\sqrt[3]{\frac{3V}{4\pi}}

2. Substitute values:

r=\sqrt[3]{\frac{3(66,840.28ft^{3})}{4\pi}}=25.17ft

3. Substitute the value of the radius into the equation fo calculate the surface area of a sphere, then you obtain that the surface area of a typical spherical water tower is:

SA=4r^{2}\pi\\SA=4(25.17ft)^{2} \pi\\SA=7,964.95ft^{2}

3. If a city has 25 gallons of paint available and one gallon of paint covers 400 square feet of surface area, you must multiply 25 by 400 square feet to know if there will be enough to paint the outside of a typical spherical water tower.

25*400ft^{2}=10,000ft^{2}

As you can see, there will enough to paint the outside of a typical spherical water tower.

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3 years ago
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