A clerk found the mean of 30 test scores to be 62. Later it came out that one score of 75 had been typed as 57, and that every student was also owed 3 bonus marks. What is the correct mean?

Question

Accepted Answer

65.6. Corrected sum =30×62-57+75=1878, mean =62.6. Adding 3 to every score adds 3 to the mean: 65.6. (64.4 corrects the error the wrong way.)

A clerk found the mean of 30 test scores to be 62. Later it came out that one score of 75 had been typed as 57, and that every student was also owed 3 bonus marks. What is the correct mean?

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