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Assume that the duration of human pregnancies can be described by a Normal model

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Assume that the duration of human pregnancies can be described by a Normal model with mean 266 days and standard deviation 15 days.

a) What percentage of pregnancies should last between 269 and 277 days?

b) At least how many days should the longest 15% of all pregnancies last?

c) Suppose a certain obstetrician is currently providing prenatal care to 63 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?

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[Solved] Assume that the duration of human pregnancies can be described by a Normal model

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