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For two data sets, each of size 5, the v...

For two data sets, each of size 5, the variances are given to be 4 and 5 and the corresponding means are given to be 2 and 4, respectively. The variance of the combined data set is (1) `(11)/2` (2) 2 (3) `(13)/2` (4) `5/2`

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