Question

Find the mean if the following distribution:-
Value
X - 5, 10, 15, 20 , 25
F- 4, 12, 20, 28, 36

Answer 1

Answer:

Mean =

∑f

i

∑x

i

f

i

⇒mean =

6+p+6+10+5

(5×6)+(10×p)+(15×6)+(20×10)+(25×5)

⇒mean =

27+p

30+10p+90+200+125

=15

⇒405+15p=445+10p

⇒5p=40

⇒p=8