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11 September, 07:19

A professor has recorded exam grades for 10 students in his class, but one of the grades is no longer readable. If the mean score on the exam was 82 and the mean of the 9 readable scores is 86 , what is the value of the unreadable score?

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  1. 11 September, 07:25
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    10 X 82 = 820 - 9 X 86 = 774. 820 - 774 = 46 A = 46
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