Explanation Given: The mean is 56 , 000 mi and the standard deviation is 3500 mi. Approach: A normal distribution has a graph which is bell-shaped curve or normal curve. Within one standard deviation of the mean, about 68 % of the values lies, within two standard deviations, about 95 % of the values lie and within 3 standard deviation, about 99.7 % of the values lie. Calculation: Since, there is 2 standard deviation only on one side of the mean, so, put the values in the normal curve as shown below

A Problem Solving Approach to Mathematics for Elementary School Teachers (12th Edition)

12th Edition

ISBN: 9780321987297

Author: Rick Billstein, Shlomo Libeskind, Johnny Lott

Publisher: PEARSON

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Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

Chapter 10.4B, Problem 24A

To determine

To find:

The number of tires that are likely to wear out before 49,000 mi.

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Chapter 10.4B, Problem 23A

Chapter 10.4B, Problem 25A

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A Problem Solving Approach to Mathematics for Elementary School Teachers (12th Edition)

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