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The length of the human pregnancies from conception to birth varies according to an approximately normal...

The length of the human pregnancies from conception to birth varies according to an approximately normal distribution with mean 266 days and standard deviation 16 days. (a) What percentage of pregnancies last less than 270 days? (b) What percentage of pregnancies last longer than 282 days? (c) What percentage of pregnancies last between 240 to 270 days? (d) How long do the longest 20% of pregnancies last?

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