MHB Construct the 99% confidence interval estimate

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A simple random sample of 400 high school football players was taken in order to estimate the mean weight of all high school football players. The sample has a mean of 198 lbs. and a standard deviation 26 lbs. Construct the 99% confidence interval estimate of the mean weight of all high school football players.
 
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Hello and welcome to MHB! :D

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