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baby weights: the weight of male babies less than 2 months old in the United States...

baby weights: the weight of male babies less than 2 months old in the United States is normally distributed with mean 11.5 pounds and a standard deviation of 2.5 pounds. what portion of the babies weigh between 9 and 14 pounds?

Math   Statistics-And-Probability   
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Answer #1

Given that, mean = 11.5 pounds

standard deviation = 2.5 pounds

We want to find, P(9 < X < 14)

Therefore, the probability that the babies weigh between 9 and 14 pounds is 0.6826

In percentage : 68.26%

Note: By empirical rule we get 68% of the babies weigh between 9 and 14 pounds (that is between 1 standard deviations of the mean.)

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