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Descriptive Statisticshard
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For two datasets AAA (nA=20,xˉA=10,σA2=4n_A=20, \bar{x}_A=10, \sigma_A^2=4nA​=20,xˉA​=10,σA2​=4) and BBB (nB=30,xˉB=20,σB2=9n_B=30, \bar{x}_B=20, \sigma_B^2=9nB​=30,xˉB​=20,σB2​=9), what is the variance of the combined dataset?