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2. The length of human pregnancies (say X) from conception to birth varies according to a normal distribution with mean 266 days and standard deviation

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2. The length of human pregnancies (say X) from conception to birth varies according to a normal distribution with mean 266 days and standard deviation 16 days. Find, Percent of pregnancies that exceed 280 days. ii ) Percent of pregnancies that are between 250 days and 290 days

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