SOLUTION: The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with mean 263 days and standard deviation 16 days. About 99

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Question 1048101: The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with mean 263 days and standard deviation 16 days. About 99.7% of all pregnancies last between what interval?=
_____and_____days
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with mean 263 days and standard deviation 16 days.
About 99.7% of all pregnancies last between what interval?
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Left tail = 0.003/2 = 0.0015
Corresponding z-value = invNorm(0.0015) = -2.9677
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Corresponding lower day limit = -2.9677*16+263 = 215.51 days
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Corresponding upper day limit = +2.9677*16+263 = 310.48 days
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Cheers,
Stan H.
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