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The average marks of 65 students in a class was calculated as 150. It was later realised that the marks of one of the students was calculated as...
Solution
Total sum of the marks of all the students in a class is = 150 × 65 = 9750Difference between the correct score...
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Keynote
Difference between the correct score and wrong score is = 152 − 142 = 10Correct average marks of the group is=...
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