Ononot — Two datasets A and B are combined. Dataset A has nA = 20, \b

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Descriptive Statisticshard

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Two datasets A and B are combined. Dataset A has $n_A = 20, \bar{x}_A = 10, \sigma_A^2 = 4$ . Dataset B has $n_B = 30, \bar{x}_B = 20, \sigma_B^2 = 9$ . What is the variance of the combined dataset?