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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