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The life span of a type of automatic washer is normally distributed with the mean of 3.8 years and standard deviation of 1.2 years. a. Probability that life span of randomly selected washer will be more than 3 years is b. The percent of the washers with the life span between 3.5 years and 4.5 years is_ c. The dealer wants only 2.5% of the washers to fail before the end of guarantee period. Then the length of guarantee period is years. Give the answer for number of years with one digit after decimal point.

The life span of a type of automatic washer is normally distributed with the mean of 3.8 years and standard deviation of 1.2 years. a. Probability that life span of randomly selected washer will be more than 3 years is b. The percent of the washers with the life span between 3.5 years and 4.5 years is_ c. The dealer wants only 2.5% of the washers to fail before the end of guarantee period. Then the length of guarantee period is years. Give the answer for number of years with one digit after decimal point.

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
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 life span of a type of automatic washer is normally distributed with the mean of 3.8 years and standard deviation of 1.2 years. a. Probability that life span of randomly selected washer will be more than 3 years is b. The percent of the washers with the life span between 3.5 years and 4.5 years is c. The dealer wants only 2.5% of the washers to fail before the end of guarantee period. Then the length of guarantee period is years. Give the answer for number of years with one digit after decimal point. F
Transcribed Image Text:The life span of a type of automatic washer is normally distributed with the mean of 3.8 years and standard deviation of 1.2 years. a. Probability that life span of randomly selected washer will be more than 3 years is b. The percent of the washers with the life span between 3.5 years and 4.5 years is c. The dealer wants only 2.5% of the washers to fail before the end of guarantee period. Then the length of guarantee period is years. Give the answer for number of years with one digit after decimal point. F
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