For two data sets each of size is 5 , the variances \( \mathrm{P}^{...

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For two data sets each of size is 5 , the variances
\( \mathrm{P}^{13: 4} \) are given to be 4 and 5 and the corresponding

W. means are given to be 2 and 4 respectively, then the variance of the combined data set is:
(1) \( \frac{5}{2} \)
(2) \( \frac{11}{2} \)
(3) 6
(4) \( \frac{13}{2} \)
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