# Question

A law enforcement agency, administering breathalyzer tests to a sample of drivers stopped at a New Year’s Eve roadblock, measured the following blood alcohol levels for the 25 drivers who were stopped:

a. Calculate the mean and standard deviation for this sample.

b. Use Chebyshev’s theorem to determine the minimum percentage of observations that should fall within k = 1.50 standard deviation units of the mean. Do the sample results support the theorem?

c. Calculate the coefficient of variation for these data.

A computer and statistical software will be desirable and useful. However, any necessary calculations can also be done with the aid of a pocket calculator. For readers using statistical software, keep in mind the file-naming key— for example, the data for Exercise 3.57 will be in data file XR03057.

In exercise

a. Calculate the mean and standard deviation for this sample.

b. Use Chebyshev’s theorem to determine the minimum percentage of observations that should fall within k = 1.50 standard deviation units of the mean. Do the sample results support the theorem?

c. Calculate the coefficient of variation for these data.

A computer and statistical software will be desirable and useful. However, any necessary calculations can also be done with the aid of a pocket calculator. For readers using statistical software, keep in mind the file-naming key— for example, the data for Exercise 3.57 will be in data file XR03057.

In exercise

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