the average marks in science subject of a class of 20 students is 68. if the marks of two students were ,isread as 48 and 65 of the actual marks 72 and 61 respectively, then what would be the correct average?
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Total marks of 20 students = 20 x 68 = 1360
The marks of 18 students after taking out wrong marks = 1360 - (48 + 65) = 1247
Total marks of 20 stusents after correcting the marks = 1247 + 72 + 61 = 1380
Correct Average = 1380/20 = 69
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