Anoop calculated his average over the last 24 tests and found it to be 76. He finds out that the marks for three tests have been reversed by mistake. The correct marks for these tests are 87, 79 and 98. What is the approximate percentage difference between his actual average and his incorrect average? *
Answers
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Answer:
There will be no difference in the actual average and the incorrect average, as the sum of the marks will be same whether they have been reversed or inverted.
Explanation:
The Average of the 24 test is found out out be 76. But Anoop made a mistake as he reversed the marks to three test and the correct marks will be 87, 79 and 98.
But here we need to understand that the sum of marks will not change by the inversion of marks and the number of subjects remains same so there will be no change in the average.
As, Average is calculated by the sum of the given number dividing the total number given. So if the actual marks get inverted there will be no change in their sum thus, average will remain same.
So, the difference between the actual average and the incorrect average will be 0.
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