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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`

A

`6`

B

` 13//2`

C

` 5//2`

D

` 11//2`

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The correct Answer is:
D
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