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?

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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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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