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review3 - Unit Review TEST 3 Statistics 1 Replacement times...

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Unit Review - TEST 3 - Statistics 1. Replacement times for CD players are normally distributed with a mean of 7.1 years and a standard deviation of 1.4 years. A) Find the probability that a randomly selected CD player will have a replacement time less than 8.0 years . B) If 45 CD players are randomly selected, how many of them would you expect to have a replacement time less than 8.0 years. C) If 45 CD players are randomly selected, find the probability that they will have a mean replacement time greater than 7.0 years . D) Find the probability that 45 randomly selected CD players will have a mean replacement time between 6.8 years and 7.2 years. 2. A sample consists of 75 TV sets purchased several years ago. The replacement times of those TV sets have a mean of 8.2 years and a standard deviation of 1.1 years. A) Construct a 95% confidence interval for the mean replacement time of all TV sets from that era. B) Construct a 86% confidence interval for the mean replacement time of all TV sets from that era.
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