The average of marks of 17 students in an examination was calculated as 71 But it was later found th...........

Quantitative Aptitude (CGL) Average

The average of marks of 17 students in an examination was calculated as 71. But it was later found that the mark of one student had been wrongly entered as 65 instead of 56 and another as 24 instead of 50. The correct average is

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Explanation:

The total marks obtained by the students= 71* 17= 1207;
After correction, The total marks obtained= 1207 – 65 + 56 -20 +50= 1228;
The average of marks obtained by the students= 1228/ 17 = 72.23;