The mean life time of the fruit fly drosophila melanogaster, Ask an Expert

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The mean life time of the fruit fly, Drosophila melanogaster in a laboratory, is 60 days with a variance of 235 days2. If a sample of 45 flies were taken from this population, what is the probability that the mean life time is (a) less than 55 (b) between 58 and 66 (c) greater than 65 days?

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