JEE Math Practice Question
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
- A.$${5 \over 2}$$
- B.$${11 \over 2}$$
- C.6
- D.$${13 \over 2}$$
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