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

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Two datasets A and B have $n_A = 10, \bar{x}_A = 20, s_A^2 = 5$ and $n_B = 10, \bar{x}_B = 30, s_B^2 = 5$ . What is the combined mean?