Please solve this....
Dear Student
Mean = Σfm / Σf
42 = 1390+40X /34+X
1428+42X = 1390 + 40X
2X = -38
X = -19
X = 19
Regards
| Salaries | Mid Value | f | fm |
|---|---|---|---|
| 5-15 | 10 | 5 | 50 |
| 15-25 | 20 | 6 | 120 |
| 25-35 | 30 | 7 | 210 |
| 35-45 | 40 | X | 40X |
| 45-55 | 50 | 4 | 200 |
| 55-65 | 60 | 3 | 180 |
| 65-75 | 70 | 9 | 630 |
| Σf = 34+X | 1390+40X | ||
| N = 7 | |||
| Mean = 42 | |||
42 = 1390+40X /34+X
1428+42X = 1390 + 40X
2X = -38
X = -19
X = 19
Regards