SOLUTION: If 20 TV sets are selected, what is the probability that the mean replacement time is longer than 7.8 years?

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Question 1193494: If 20 TV sets are selected, what is the probability that the mean replacement
time is longer than 7.8 years?
Answer by ikleyn(52817) About Me  (Show Source):
You can put this solution on YOUR website!
.

Makes no sense.