The quadratic mean (or root mean square, or R.M.S.) is used in physical applications, such as power

Question:

The quadratic mean (or root mean square, or R.M.S.) is used in physical applications, such as power systems. The quadratic mean of a set of values is obtained by squaring each value, adding those squares, dividing the sum by the number of values n, and then taking the square root of that result, as indicated below:

Find the R.M.S. of these voltages measured from household current: 0, 60, 110, -110, -60, 0. How does the result compare to the mean?

Distribution
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