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Problems 16-18: Lengths of pregnancies are normally distributed with a mean of 268 days and a...

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Statistics

Problems 16-18: Lengths of pregnancies are normally distributedwith a mean of 268 days and a standard deviation of 15 days.(Usethe z-table). What percentage of pregnancies last less than 250days?

What percentage of pregnancies last more than 280 days?

If 60 pregnant women were randomly selected, how likely is itthat their mean pregnancy length is greater than 275 days? Youranswer:

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