Question

Find the mean and variance for the data: | xi | 92 | 93 | 97 | 98 | 102 | 104 | 109 | |----|----|----|----|-----|-----|-----|-----| | fi | 3 | 2 | 3 | 2 | 6 | 3 | 3 |

Find the mean and variance for the following frequency distribution: | Classes | 0-30 | 30-60 | 60-90 | 90-120 | 120-150 | 150-180 | 180-210 | |---------|------|-------|-------|--------|---------|---------|---------- | | Frequencies | 2 | 3 | 5 | 10 | 3 | 5 | 2 |