Question 124

The average marks of a class of 35 children is 35. The marks of one of the students, who got 35, was incorrectly entered as 65. What is the correct average of the class ?

Solution

Average marks of 35 children = 35

=> Sum of marks of 35 children = $$35\times35=1225$$

After correcting the mistake new sum = $$1225-65+35=1195$$

=> Correct average = $$\frac{1195}{35}=34.14$$

=> Ans - (B)

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