| Category | A | B | C | D | E | F | G |
| Wages (in Rs) per day | 50 | 60 | 70 | 80 | 90 | 100 | 110 |
| No. of workers | 2 | 4 | 8 | 12 | 10 | 6 | 8 |
| Category | Wages in Rs. (x) | No. of workers f | fx |
| A | 50 | 2 | 100 |
| B | 60 | 4 | 240 |
| C | 70 | 8 | 560 |
| D | 80 | 12 | 960 |
| E | 90 | 10 | 900 |
| F | 100 | 6 | 600 |
| G | 110 | 8 | 880 |
| Total | Ʃf = 50 | Ʃfx = 4240 |
Mean = Ʃfx/Ʃf
= 4240/50
= 84.8
= 85
Hence the mean is 85.
(ii)If number of workers is doubled, then total number of workers = 50×2 = 100
So wages will be doubled.
Total wages = 4240×2 = 8480
Mean = Ʃfx/Ʃf
= 8480/100
= 84.8
= 85
Hence the mean is 85.