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The following distribution shows the daily pocket allowance given to the children of a multistory building. The average pocket allowance is Rs. 18.00. Find out the missing frequency.
| Class interval: | 11 – 13 | 13 – 15 | 15 – 17 | 17 -19 | 19 – 21 | 21 – 23 | 23 – 25 |
| Frequency: | 7 | 6 | 9 | 13 | …. | 5 | 4 |