Mean of 2, 4, 6, 6, Mean of 10, 20, 30, 20, Mean of 8, 12, 16, 12, Mean of 15, 25, 35, 25, Mean of 18, 24, 30, 24, Mean of 40, 50, 60, 50, Mean of 9, 15, 21, 15, Mean of 30, 25, 35, 30, mean of 10,10, 10.

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