18. Information from the Department of Motor Vehicles indicates that the average age of licensed drivers is

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18. Information from the Department of Motor Vehicles indicates that the average age of licensed drivers is

 39.7 years with a standard deviation of

 12.5 years. Assuming that the distribution of drivers’ ages is approximately normal,

a. What proportion of licensed drivers are more than 50 years old?

b. What proportion of licensed drivers are less than 30 years old?

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Essentials Of Statistics For The Behavioral Sciences

ISBN: 9780495812203

7th Edition

Authors: Frederick J. Gravetter, Larry B. Wallnau

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