Posted by **Brian** on Wednesday, August 1, 2012 at 9:10pm.

A random sample of forty-eight 200 meter swims has a mean of 3:12 minutes and a standard deviation of .09 minute. Construct a 95% confidence interval for the population mean time.

I know u: 3.12, sx: .09, n:48, c:.95

What is the formula I use to find the answer? Can anyone please leave a step by step on how to do it so I can learn and do other problems?

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