The tread life of a particular brand of tire is a random variable best describe by a normal distribution with a mean of 60,000 miles and a standard deviation of 1400 miles. What is the probability that the average life of 4 tires is greater than 58,600 miles?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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The tread life of a particular brand of tire is a random variable best describe by a normal distribution with a mean of 60,000 miles and a standard deviation of 1400 miles. What is the probability that the average life of 4 tires is greater than 58,600 miles?

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