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The gestation time of humans has an approximate Normal distribution with a mean of 250 days...

  1. The gestation time of humans has an approximate Normal distribution with a mean of 250 days and a standard deviation of 6.0 days. A Simple Random Sample of newborns is taken. How large of a sample is needed so that the sampling distribution of  has a standard deviation of 0.5 day?
math   Statistics-And-Probability   
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