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The mean length of a human pregnancy is 265265 ​days, with a standard deviation of 1111...

The mean length of a human pregnancy is

265265

​days, with a standard deviation of

1111

days. Use the empirical rule to determine the percentage of women whose pregnancies are between

254254

and

276276

days.​ (Assume the data set has a​ bell-shaped distribution.)

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The percentage of women whose pregnancies are between 254 and 276 days is

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