The following distribution shows the daily pocket allowance of children of a locality. The mean
pocket allowance is ₹ 18. Find the missing frequency f.
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class interval. class mark. f. xifi
11-13. 12. 7. 84
13-15. 14. 6. 84
15-17. 16. 9. 144
- 17-19. 18. 13. 234
19-21. 20. f. 20f
21-23. 22. 5. 110
23-25. 24. 4. 96
34+f. 752+20f
mean = 752+20f /34+f
18 (34+f) = 752+20f
612+18f = 752+20f
140= -2f
f = -70
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f=20
solve by direct formula
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