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If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55 and 60, then the average marks of all the students is
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- 54.68
- 53.33
- 55
- None of these
- 54.68
Correct Option: A
We find the required average with the help of given formula ,
Here, n1 = 55 , a1 = 50
n2 = 60 , a2 = 55 , n3 = 45 , a3 = 60
| ∴ Average = | n1 + n2 + n3 |
| The required average marks = | |
| 55 + 60 + 45 |
| The required average marks = | |
| 160 |
| The required average marks = | = 54.68 | |
| 160 |
