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please help me with this problem please The length of human pregnancies from conception to birth approximates a normal distribution with a mean of 266

please help me with this problem please

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The length of human pregnancies from conception to birth approximates a normal distribution with a mean of 266 days and a standard deviation of 16 days. What proportion of all pregnancies will last between 240 and 270 days (roughly between 8 and 9 months)? Write your answer as a decimal with 4 digits

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