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KiRa [710]
3 years ago
11

Suppose that 40% of households use their cell phones for their home phone. If 12 households are randomly selected, what is the p

robability that at least three use their cell phones
Mathematics
1 answer:
Vesna [10]3 years ago
4 0

Answer:

0.917

Step-by-step explanation:

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A set of angles has a ratio of 5 to 2. If the larger angle measures 105 degrees then what is the measure of the smaller angle
bekas [8.4K]

ratio 5:2

105, ___

5x = 105 → x = 21

2x = ____ → 2(21) = 42

Answer: 42°

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Suppose the number of gallons of gasoline per day used by a car is normally distributed with a mean of 2.2 gallons and a standar
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The difference in gallons per day used is 3.6.

The formula to calculate a z-score is:
z=\frac{X-\mu}{\sigma},

where X is the value used to calculate the score, μ is the mean and σ is the standard deviation.  We have the z-scores so we must work backward:

3=\frac{X-2.2}{1.2}\text{ and }0=\frac{X-2.2}{1.2}

For both equations, we will cancel the 1.2 by multiplying both sides:
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Now we will cancel 2.2 from both equations by adding it to both sides:

3.6+2.2=X-2.2+2.2     and       0+2.2=X-2.2+2.2
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The difference in gas used per day would be given by
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3 years ago
Martin would like to start training to run a marathon. The first week he runs a total of 15 miles. He would like to run 0.3 more
anygoal [31]

Answer: 15.3 miles

Step-by-step explanation:

From the question, we are informed that Martin would like to start training to run a marathon and that first week he runs a total of 15 miles.

We are further told that he would like to run 0.3 more miles each week than the week before. There, the number of miles that Martin will run the second week will be:

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3 years ago
F(x)=(4t^2-t) (t^3-8t^2+12) in product rule.<br>​
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Which expression gives the volume of a sphere with radius 7?
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A. is your answer 

Hope this helps! :)
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