Question

Replacement times for TV sets are normally distributed with mean of 8.2 years and a standard...

Replacement times for TV sets are normally distributed with mean of 8.2 years and a standard deviation of 1.1 years.

  1. Find the probability that a randomly selected TV will have a replacement time less than 5.0 years.(5%)
  1. Find the probability that a randomly selected TV will have a replacement time between 7 and 9 years? (5%)
  1. If you want to provide a warranty so that only 1% of the TV sets will be replaced before warranty expires, what is the time length of the warranty? (6%)
Math   Statistics-And-Probability   
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Answer #1

The probability that a randomly selected TV will have a replacement time less than 5.0 years is .0018

The probability that a randomly selected TV will have a replacement time between 7 and 9 years is .6285

The time length of the warranty, so that only 1% of the TV sets will be replaced before warranty expires is 5.64 years

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