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average 90,94,53,68,79,84,87,72,70,69,65,89,85
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Solution
77.30769…
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Quadratic Mean
For a data set containing the values a1,…,an (n elements) the quadratic mean (root mean square), xrms=√x12+x22+…+xn2n
Compute the sum of the squared terms of the data set:x12+x22+…+xn2=79451