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The average marks of 40 students in an English exam are 72. Later it is found that three marks 64, 62 and 84 were wrongly entered as 60, 65 and 73. The average after mistakes were rectified iS

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total marks of 40 student is =72*40=2880

total of wrong marks is 64+62 +84=210
total of correct marks is 60+65+73 =198

it means wrong marks is more than correct marks by 12
because 210-198=12

it also means that it we reduce 12 marks from whole marks of 40 student then we get actual marks of 40 students
ir means 2880-12=2868

and the avg of 40 student is 2868/40=71.7
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