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Assume that the duration of human pregnancies can be described by a normal model with mean...

Assume that the duration of human pregnancies can be described by a normal model with mean 265 days and standard deviation 17 days.

A) What percentages of pregnancies should last between 268 and 279 days?

B) At least how many days should the longest 30% of all pregnancies last?

C) Suppose a certain obstetrician is currently providing prenatal care to 51 pregnant women. Let y represent the mean length of their pregnancies. According to the Central Limit Theorem, What's the distribution of this sample mean, y? Specify the model, mean, and standard deviation?

D) What's the probability that the mean duration of these patients' pregnancies will be less than 256 days?

Math   Statistics-And-Probability   
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