18. Information from the Department of Motor Vehicles indicates that the average age of licensed drivers is
Question:
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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Related Book For
Essentials Of Statistics For The Behavioral Sciences
ISBN: 9780495812203
7th Edition
Authors: Frederick J. Gravetter, Larry B. Wallnau
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