What is the value of (2x + 3y), if mean of the following distribution is 54?
|
Class |
0 - 20 |
20 - 40 |
40 - 60 |
60 - 80 |
80 - 100 |
Total |
|
Frequency |
7 |
11 |
x |
9 |
y |
50 |
1
69
2
59
3
57
4
56