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The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with mean 266 days and standard deviation 16 days. According to the empirical rule, approximately 95% of all pregnancies last between what?

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LammettHash
The empirical rule says about 95% of any normal distribution lies within two standard deviations of the mean. This means in this case 95% of pregnancies last between

[tex]266-2\times16=234[/tex]

and

[tex]266+2\times16=298[/tex]

days.

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