If the mean of the following data is 15. Find p.
x :
5
10
15
20
25
f :
6
p
X
f
fx
30
10p
90
200
125
N = p + 27
∑fx = 10p + 445
Given, mean = 15
= 15
15p – 10p = 445 – 405
5p = 40
p =
= 8