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How do I do this statistical calculation?
I took statistics over 35 years ago and I don’t remember this.
I have a population of data, 130 instances. My average is 1500 and my standard deviation =stdevp () is 611.
Which values are one standard deviation away from the mean and which values are two standard deviations away from the mean.
I can’t find a 2nd standard deviation function in Excel.