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One hundred people are included in a study in which they are compared to a known population that has a mean of 73, a standard

One hundred people are included in a study in which they are compared to a known population that has a mean of 73, a standard deviation of 20, and a rectangular distribution

If the sample mean is 75, the lower limit for the 99% confidence interval is?

I want to learn how to do the equation for this, please

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