Question 165

The average marks obtained by a student in 6 subjects is 88. On subsequent verification it was found that the marks obtained by him in a subject was wrongly copied as 86 instead of 68. The correct average of the marks obtained by him is

Solution

Average = $$\frac{Sum of Elements}{Number of Elements}$$

Number of subjects = 6

wrong average = 88

sum of marks calculated wrongly in all subjects = 88 x 6 = 528

Correct Marks = 528 - 86 + 68 = 510

Correct Average of marks = $$\frac{510}{6}$$ = 85

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