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According to the National Center for Health Statistics, in 2005 the average birthweight of a newborn...

According to the National Center for Health Statistics, in 2005 the average birthweight of a newborn baby was approximately normally distributed with a mean of 120 ounces and a standard deviation of 20 ounces. What percentage of babies weigh between 100 and 140 ounces at birth? 47.72%, 68.26%, or 95.44%?

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Answer:

From the given data,

we find the standard deviation as 20 ounces

for the range between 100 and 140

=> there are 2 standard deviations between them (2*20)

=> Probability = 68.26%

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