class interval 0-6 6-12 12-18 18-24 24-30 frequency 6 8 10 9 7 find mean by direct mean method
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Step-by-step explanation:
class fre. mid free*mid value
interval value.
0-6. 6. 3. 18
6-12. 8 9. 72
12-18. 10. 15. 150
18-24. 9. 21. 189
24-30. 7. 27. 189
N=40. fm=618
mean =fm/N
= 618/40
=15.45
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