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Question -

If the mean of the following data is 18.75. Find the value of p.

X

10

15

P

25

30

f

5

10

7

8

2



Answer -


⇒ 460 + 7p = 32 (18.75)
⇒ 460 + 7p = 600
⇒ 7p = 600 – 460 = 140
⇒ p =  140/7 = 20
∴ p = 20

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