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find the sample variance for the following data set using xi and (xi^2) 20.2, 21.8, 17.6 , 21.6 , 19.5 , 19.8 , 18.6

find the sample variance for the following data set using xi and (xi^2)

20.2, 21.8, 17.6 , 21.6 , 19.5 , 19.8 , 18.6

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