What percentage should last between 272 and 280 ?days

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Normal model with mean 266 days and standard deviation 16 days.

?a) What percentage should last between 272 and 280 ?days?

?b) How many days should the longest 10% last?

?c) Suppose a certain obstetrician is currently providing prenatal care to 57 pregnant women. y represents the mean length of pregnancies. According to 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 pregnancies will be less than 256 ?days?

Reference no: EM132399845

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