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May 14th, 2016, 01:20 PM   #1
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maths statistics

hi i cant solve this

Assume the duration of human pregnancies can be described by a normal model with a mean 270 days and a standard deviation of 15 days
(i) using the empirical rule write down the 95% confidence interval for the mean pregnancy duration
(ii)At least how many days should the upper quartile of pregnancies last
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May 22nd, 2016, 02:48 AM   #2
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Hey markosheehan.

Do you understand 95% has rougly +- 1.96 standard deviations from the mean? (for a Normal distribution that is)?
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