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2. The length of pregnancies from conception to birth varies according to a distribution which is approximately normal with mean 266 days and a standard
2. The length of pregnancies from conception to birth varies according to a distribution which is approximately normal with mean 266 days and a standard deviation of 16 days. Use the 68-95- 99.7 rule to answer the following: a) almost all (99.7%) pregnancies fall into what range? b) how long are the longest 2.5% of all pregnancies? There is the example in excel at 3rd April
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