Chapter 6, Problem 18P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

Information from the Department of Motor Vehicles indicates that the average age of licensed drivers is μ = 45.7 years with a standard deviation of σ *=* 12.5 years. Assuming that the distribution of drivers’ ages is approximately normal,

**a.**What proportion of licensed drivers are older than 50 years old?**b.**What proportion of licensed drivers are younger than 30 years old?

**(a)**

To determine

**To find:** The proportion of licensed drivers are older than 50 years old.

Explanation

**Given info:**

The information is collected from the department of motor vehicles. It indicating that the average age of licensed drivers and it follows the normal distribution with mean of

**Calculation:**

The formula for z score is,

Substitute the value 50 for *X*, 45.7 for

**(b)**

To determine

**To find:** The proportion of licensed drivers are younger than 30 years old.

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