How to. Find mean without class intervals
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x. f. f(x).
10. 5. 10×5=50.
15. 2. 15×2×30.
12. 8. 12×8=96.
17. 9. 17×9=153.
20. 5. 20×5=100.
9. 6. 9×6=54.
8. 2. 8×2=16.
€f=37. €f(x)=499.
Mean=€f(x)/€f.
=499/37.
=13.48648648648.
The symbol is not correct.
I think this is your answer.
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