7.) Assume that the speed of automobiles on an expressway during rush hour is normally distributed with a mean of 62 mph and a standard deviation of 5. a.) What percent of cars are traveling faster than 64 mph? b.) What percent of cars are traveling slower than 56 mph? What percent of cars are traveling between 53 mph and 69 mph?

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A: Given data, μ=70σ=6

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Q: For this set of data, the standard deviation (s) is equal to: 9, 8, 10, 5, 5, 2, 3, 6, 3

A: Mean:The formula for finding mean is shown below:

Q: for this set of data, the standard deviation is equal to: 9,8,10,5,5,2,3,6,3

A: Mean:The formula for finding mean is shown below:

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A:

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A: sample size(n) = 81population standard deviation = 1.5 hoursstandard error for mean = ?

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A:

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A: See the handwritten solution

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A: The random variable vehicle speed follows normal distribution. The population mean is 70. The…

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