Question

Class. f
1-3. 9
3 -3. 22
5-7. 27
7-9. 17
Find mean​

Answer 1

Class intervals:1-3, 3-5, 5-7, 7-9

Frequency(fi): 9 +22.+27. +17=75

Class marks: 2. 4. 6. 8

fixi: 18. + 88 +162+136=404

Mean=sigmafixi/sigmafi=404/75=5.386

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