Question

The average marks of 100 students are given to be 40. It was found later that marks of one students were 53 which were misread as 83. The corrected mean marks are
1. 39
2. 39.7
3. 40
4. 40.3

Answer 1

Correct Answer - Option 2 : 39.7

Given:

The average marks of 100 students are given to be 40

Calculation:

⇒ Before total marks of 100 student = 100 × 40 = 4000

⇒ The difference of marks a student = 83 - 53 = 30

⇒ The new average = (4000 - 30)/100 = 39.7

∴ The required result will be 39.7.