Find the missing frequency (p) for the following distribution whose mean is 7.68.
x: | 3 | 5 | 7 | 9 | 11 | 13 |
f : | 6 | 8 | 15 | p | 8 | 4 |
x | f | fx |
3 | 6 | 18 |
5 | 8 | 40 |
7 | 15 | 105 |
9 | P | 9P |
11 | 8 | 88 |
13 | 4 | 52 |
N = P + 41 | ∑fx = 9P + 303 |
Given, mean = 7.68
= 7.68
= 7.68
9P – 7.68P = 314.88 – 303
1.32P = 11.88
P =
P = 9