Calculate mean for the following frequancy distribution CI 5-9 10-14 15-19 20-24 25-29 30-34 THIS IS CLASS INTERVALS not minus frequancy 3 4 8 10 3 2 this is frequancy for up class interval one
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Finding mean by direct method
class. class mark. frequency. class mark×
(xi ). (fi). frequency
(xi×fi)
5-9. 7. 3. 21
10-14. 12. 4. 48
15-19. 17. 8. 136
20-24. 22. 10. 220
25-29. 27. 3. 81
30-34. 32. 2. 64
Total. { fi= 30. {xifi=570
_
mean X = {xifi ÷ { xi
= 570÷30
mean = 19
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