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Study Stuff for MCA Examinations - NIMCET
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The mean and variance of a set of $15$ numbers are $12$ and $14$ respectively.
The mean and variance of another set of $15$ numbers are $14$ and $\sigma^{2}$ respectively.
If the variance of all the $30$ numbers in the two sets is $13$, then $\sigma^{2}$ is equal to:
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