Question

If the mean of the following data is 21 , find the value of p .
x = 10,15,p,25,30
f=3,5,2,5,5

Answer 1

Answer:

Mean =

∑f

i

∑x

i

f

i

⇒mean =

3+10+25+7+5

(10×3)+(15×10)+(p×25)+(25×7)+(35×5)

⇒mean =

3+10+25+7+5

30+150+25p+175+175

=20.6

⇒20.6=

50

1030+25p

⇒25p=500

⇒p=20

Answer 2

Answer:

mean 80/5

Step-by-step explanation:

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