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Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard
Deviation of 1.1 years, (based on data from "Getting Things Fixed," Consumer Reports) .
(i. The replacement time that separated the top 20% from the bottom 80% is 9.124 years.
(ii. The probability that a randomly selected TV will be replaced in less than 4.0 years is 0.40.
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