Profit per shop (in Rs) | Number of shops (fi) |
100 - 200 | 10 |
200 - 300 | 18 |
300 - 400 | 20 |
400 - 500 | 26 |
500 - 600 | 30 |
600 - 700 | 28 |
700 - 800 | 18 |
Profit (in Rs) | No. of shops (fi) | Mid-point (xi) | Deviation di=xi−450 | fidi |
100 - 200 | 10 | 150 | -300 | -300 |
200 - 300 | 18 | 250 | -200 | -3600 |
300 - 400 | 20 | 50 | -100 | -2000 |
400 - 500 | 26 | 70 | 0 | 0 |
500 - 600 | 30 | 90 | 100 | 3000 |
600 - 700 | 30 | 90 | 100 | 5600 |
600 - 800 | 18 | 750 | 300 | 5400 |
150 | 5400 |