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In a study 800 children had a mean age of 8.9 years, a standard deviation of 3.98 years, and their ages were normally distributed. If

In a study 800 children had a mean age of 8.9 years, a standard deviation of 3.98 years, and their ages were normally distributed. If 38 of these children are randomly selected find the probability that their mean age is between 7.5 and 10.5.

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