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3. A sample of the lengths of human pregnancies (from fertilization to birth) is normally distributed, with a mean of 266 days and a standard

3. A sample of the lengths of human pregnancies (from fertilization to birth) is normally distributed, with a mean of 266 days and a standard deviation of 16 days. What percentage of these pregnancies is greater than 275 days? What percentage of these pregnancies is less than 249 days? What percentage of these pregnancies is between 266 days and 275 days

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