CBSE Class 10 Maths (Standard) 2018 · Paper 30/2/1 · Question 29(a)
The mean of the following distribution is 18. Find the frequency of the class .
| Class | 11-13 | 13-15 | 15-17 | 17-19 | 19-21 | 21-23 | 23-25 |
|---|---|---|---|---|---|---|---|
| Frequency | 3 | 6 | 9 | 13 | f | 5 | 4 |
Answer
The missing frequency is .
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