Question

Find The mean of Following data C .i 0-10 10-20 20-30 30-40 40-50 Frequence. (4) (5) (4) (6) (6)​

Answer 1

x. freq.'F' mid value'M' F. M

0-10. 4. 5. 20

10-20. 5. 15. 75

20-30. 4. 25. 100

30-40. 6. 35. 210

40-50. 6. 45. 270

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N=25. EFM=675

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Now, From table,

-

Mean x =EFM/N

=675/25

=27

Hence, The mean of the given data is 27.