Question
The average marks in geography exam of a class of 25
students are 64. If the marks of three students were misread as 44, 46 and 61 in lieu of the actual marks 54, 64 and 67 respectively, then find the correct average.Solution
Incorrect total marks= 64x25=1600 Sum of misread marks= 44+46+61 = 151 Sum of actual marks= 54+64+67 = 185 Difference= 185-151= 34 Correct total marks= 1600+34= 1634 Correct average=1634/25 =65.36
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