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de The World Health Organization reports that the distribution of ages at time of death...

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de The World Health Organization reports that the distribution of ages at time of death in the United States has a mean of 79 8 years and a standard deviation o of 15 5 years based on death certificates The distribution of ages at time of death is obviously left skewed thankfully few people die young and most die old Researchers plan to take a random sample of 100 American death certificates Macmillan Learning What is the probability that the mean age at time of death in a random sample of 100 American death certificates will be less than 78 years Give your answer to four decimal places P x 78

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