Question 403303
 A recent study of the life span of portable CD players found the average to be 3.7 years with a standard deviation of 0.6 years. If a random sample of 32 people who own CD players is selected, find the probability that the mean life time of the sample will be less than 3.4 years.
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t(3.4) = (3.4-3.7)/[0.6/sqrt(32)] = -2.8284
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P(x< 3.4) = P(t<-2.8284 when df = 31] = 0.0041
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Cheers,
Stan H.