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Question : 63
Total: 63
The mean of the following distribution is 18.
What is the value of f ?
| Class interval | Frequency |
|---|---|
| 11 - 13 | 3 |
| 13 - 15 | 6 |
| 15 - 17 | 9 |
| 17- 19 | 13 |
| 19 - 21 | f |
| 21 - 23 | 5 |
| 23 - 25 | 4 |
What is the value of f ?
[2014 CDS-I]
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