Solution:
Computation of Variance
Class | MId- Values xi | Frequencies | |||
10-20 | 15 | 2 | -1 | -2 | 2 |
20-30 | 25 | x | 0 | 0 | 0 |
30-40 | 35 | 2 | 1 | 2 | 2 |
N=4+ x |
Now,
Variance = 50
If the variance of the following frequency distribution is 50, then x is equal to
Class | 10-20 | 20-30 | 30-40 |
Frequency | 2 | x | 2 |
Computation of Variance
Class | MId- Values xi | Frequencies | |||
10-20 | 15 | 2 | -1 | -2 | 2 |
20-30 | 25 | x | 0 | 0 | 0 |
30-40 | 35 | 2 | 1 | 2 | 2 |
N=4+ x |
Now,
Variance = 50