The average of 20 numbers is 75. The number 86 was incorrectly read as 68 while calculating. Find the correct average.
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If the average of 20 numbers was calculated as 75, then the sum must have been calculated as 75×20 = 150×10 = 1500.
If 86 was misread as 68, then the true sum should be 1500-68+86 = 1518. The true average would then be 1518/20 = 759/10 = 75.9
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