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To find the sample mean of ball 2 and ball 4, we need to add the weights of the two balls and then divide by 2 (since we are finding the mean of two values).
Weight of ball 2 = 7
Weight of ball 4 = 9
(7 + 9) / 2 = 16 / 2 = 8
Therefore, the sample mean of ball 2 and ball 4 is 8.