Question

The distribution of the cost of production (in rupees) of a quaintal of wheat in 50 farms is as follows:

| cost (in rs.) | Number * aims** |
| 40 – 50 | 3 |
| 50 – 60 | 6 |
| 60 – 70 | 12 |
| 70 – 80 | 18 |
| 80 – 90 | 9 |
| 90 – 100 | 2 |
| Total | 50 |

1. Calculate the variance

1. By direct method
2. By step deviation method & compare your results with the mean deviation about the arithmetic mean.

2. Calculate the coefficient of variations by using

1. The standard deviation of costs &
2. The mean deviation of cost about the arithmetic mean & compare the two. What is your conclusion about variation of cost.