You can put this solution on YOUR website! The sum of the 12 scores = 68 * 12 = 816
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Note that * means multiply
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Subtract the two scores 70 and 63 from 816
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new sum = 816 -70 -63 = 683
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Note that we now have the sum of the remaining 10 scores
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the mean of the remaining scores is 683 / 10 = 68.3