The mean of a set of seven numbers is 81 if one of the number is discarded, then the mean of the remaining number is 78 the value of discarded number is option a 98 option B 99 option C hundred and option D 101.
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If one number is discarded then the mean becomes 78 and the total numbers becomes 6. Let the number discarded is x. But it is given that after discarding one number the mean becomes 78. Thus the excluded number is 99
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