Question: I do not understand how to use the p with 1 sigma. Could you please explain how this formula is used. And where it comes

I do not understand how to use the p with 1 sigma. Could you please explain how this formula is used. And where it comes from. I have the correct mean which is 95.12 and standard deviation of 42.37. The 2 questions in bold are what I need a detailed explanation for because it just isn't clicking.

Consider the following sample data:

101, 97, 189, 100, 95, 95, 104, 98, 2, 98, 102, 99, 101, 97, 192, 6, 103, 93, 104, 98, 99, 7, 95, 101, 102

Find the mean and standard deviation of this data.

Determine what percentage of the data lies within 1-, 2-, and 3- standard deviations of the mean.

Do the results seem to match what is predicted by the Empirical Rule? Why or why not?

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