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A tabulator while calculating the average marks of 100 students of an examination, by mistake enters 68, instead of 86 and obtained the average as 58; the actual average marks of those students is
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- 58.18
- 57.82
- 58.81
- 57.28
- 58.18
Correct Option: A
On the basis of given details in question , we have
Difference = 86 – 68 = 18
| ∴ Actual average = 58 + | |
| 100 |
Actual average = 58.18
Second method to solve this question with the help of given formula :
Here, n = 100 , m = 58 , a = 86 , b = 68
| Correct Average = m + | |
| n |
| Correct Average = 58 + | |
| 100 |
| Correct Average = 58 + | |
| 100 |
Correct Average = 58 + 0.18 = 58.18
