Question
If the mean of the frequency distribution
| Class : | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 |
|---|---|---|---|---|---|
| Frequency : | 2 | 3 | $x$ | 5 | 4 |
is 28, then its variance is __________.
Correct Answer
151
If the mean of the frequency distribution
| Class : | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 |
|---|---|---|---|---|---|
| Frequency : | 2 | 3 | $x$ | 5 | 4 |
is 28, then its variance is __________.