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Company XYZ know that replacement times for the DVD players it produces are normally distributed with...

Company XYZ know that replacement times for the DVD players it produces are normally distributed with a mean of 6.7 years and a standard deviation of 1.6 years.

Find the probability that a randomly selected DVD player will have a replacement time less than 2.2 years?
P(X < 2.2 years) =

Enter your answer accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.

If the company wants to provide a warranty so that only 1.9% of the DVD players will be replaced before the warranty expires, what is the time length of the warranty?
warranty =  years

math   Statistics-And-Probability   
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Answer #1

To find these values we need to use the standard normal tables

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