Ononot — Two datasets A and B have nA=10, \bar{x}A=20, \sigmaA^2=5 an

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Descriptive Statisticshard

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Two datasets $A$ and $B$ have $n_A=10, \bar{x}_A=20, \sigma_A^2=5$ and $n_B=20, \bar{x}_B=26, \sigma_B^2=11$ . If the two datasets are combined into a single set of $30$ values, what is the variance of the combined dataset?