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The lengths of pregnancies are normally distributed with a mean of 267 days and a standard...

The lengths of pregnancies are normally distributed with a mean of 267 days and a standard deviation of 15 days. a. Find the probability of a pregnancy lasting 309days or longer. b. If the length of pregnancy is in the lowest 33​%, then the baby is premature. Find the length that separates premature babies from those who are not premature.

The probability that a pregnancy will last

309 days or longer is nothing

Math   Statistics-And-Probability   
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