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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?
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- 33.76
- 34.14
- 35.24
- 36.50
- 33.76
Correct Option: B
According to question ,
Total correct marks of 35 children = 35 × 35 + 35 – 65 = 1225 – 30 = 1195
| Required average = | = 34.14 | |
| 35 |
Second method to find the required average ,
Diffference = – 65 + 35 = – 30
| Required average = 35 – | |
| 35 |
Required average = 35 – 0.857 = 34.143
