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The length of human pregnancies from conception to birth approximates a normal distribution with a mean of 264 days and a standard deviation of 14

The length of human pregnancies from conception to birth approximates a normal distribution with a mean of 264 days and a standard deviation of 14 days.What proportion of all pregnancies will last between 242 and 268 days ( roughly between 8 and 9 months ) a 0.554 b. 0.387 0.768 d. 0.897

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