Math, asked by vijayalaxmi85, 11 months ago

plzzzz explain this answer plzzzzz

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Answered by aman292582

0

Answer:

mean is 30

x. f. xf

5. 6. 30

10 12. 120

15. 18. 270

20. f. 20f

25 4. 100

sigma=520+20f

mean = sigmaxf/sigmaf

30=(520+20f)/40+f

30(40+f)=520+20f

120+30f=520+20f

10f=400

f=40

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