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Example: Birth weights of babies in the US have a normal distribution with a mean of 3250 grams and a standard deviation of 550 grams.
- Between what two weights do the middle 68% of newborns in the US weigh according to the 68-95-99.7 rule?
3250 – 550 = 2700 g
and 3250 + 550 = 3800g.
- Between what two weights do the middle 95% of newborns in the US weigh according to the 68-95-99.7 rule?