The average lifespan of a CleanFreek dishwasher is normally distributed with a mean of 9 years and a standard deviation of 1.8 years. Standard Normal Distribution Table a. What is the probability that a CleanFreek

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Chapter1: Combinatorial Analysis
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The average lifespan of a CleanFreek dishwasher is normally distributed with a mean of 9 years and a standard deviation of 1.8 years.

Standard Normal Distribution Table

a. What is the probability that a CleanFreek dishwasher will last longer than 11 years?
P(X > 11)=

 


b. What is the probability that a CleanFreek dishwasher will last fewer than 7 years?
P(X < 7)=

 


c. What length warranty should be established on the dishwashers so that no more than 1.6% of the units will need to be replaced under warranty?
x=

years
Round to 2 decimal places.
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