Find the value of P, if the mean of the following distribution is 18.
x: |
13 |
15 |
17 |
19 |
20 + p |
23 |
f: |
8 |
2 |
3 |
4 |
5p |
6 |
xi |
fi |
fixi |
13 |
8 |
104 |
15 |
2 |
30 |
17 |
3 |
51 |
19 |
4 |
76 |
20 + p |
5p |
5p (20 + p) |
23 |
6 |
138 |
Σfi = 23 + 5p |
Σfixi = 399 + 5p2 + 100p |