The distribution of passenger vehicle speeds traveling on a certain freeway in California is nearly normal with a mean of 72 miles/hour and a standard deviation of 4 miles/hour. Answer all the parts...

The distribution of passenger vehicle speeds traveling on a certain freeway in California is nearly normal with a mean of 72 miles/hour and a standard deviation of 4 miles/hour. Answer all the parts below using the 68-95-99.7 rule. It might be helpful to draw a diagram and shade the area of interest. Also use symmetry of the normal curve.

(a)

What percent of passenger vehicles travel between 68 and 76 miles/hour?

(b)

What percent of passenger vehicles travel slower than 68 miles/hour or faster than 76 miles/hour?

(c)

What percent of passenger vehicles travel between 64 and 80 miles/hour?

(d)

What percent of passenger vehicles travel between 72 and 76 miles/hour?

Jun 02, 2022

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The distribution of passenger vehicle speeds traveling on a certain freeway in California is nearly normal with a mean of 72 miles/hour and a standard deviation of 4 miles/hour. Answer all the parts...

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