For two data sets, each of size 5 , the variances are given to be 4...

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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
\( \mathrm{P} \) given to be 2 and 4 , respectively. The variance of the combined data set is

W
(A) \( \frac{2}{2} \)
(B) \( \frac{11}{2} \)
(C) 6
(D) \( \frac{13}{2} \)
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