Question

Company XYZ know that replacement times for the DVD players it produces are normally distributed with a mean of 8 years and a standard deviation of 1.5 years.

a) Find the probability that a randomly selected DVD player will have a replacement time less than 4.85 years?


b) If the company wants to provide a warranty so that only 0.5% of the DVD players will be replaced before the warranty expires, what is the time length of the warranty?
warranty =  years

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