The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal, with mean 266266 days and standard deviation 1313 days. Use the 68-95-99.768-95-99.7 rule to answer the questions.What range of pregnancy lengths covers almost all (99.7%)(99.7%) of this distribution?

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The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal, with mean 266266 days and standard deviation 1313 days. Use the 68-95-99.768-95-99.7 rule to answer the questions.What range of pregnancy lengths covers almost all (99.7%)(99.7%) of this distribution? 

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what percentage of pregnancies last longer than 279 days?

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