In a city, the weekly observations made in a study on the cost of living index are given in the following table:
| Cost of living index | 140-150 | 150-160 | 160-170 | 170-180 | 180-190 | 190-200 |
| Number of weeks | 5 | 10 | 20 | 9 | 6 | 2 |
Solution:
| Cost of living index | No. of weeks | Mid-points |
| 140-150 | 5 | 145 |
| 150-160 | 10 | 155 |
| 160-170 | 20 | 165 |
| 170-180 | 9 | 175 |
| 180-190 | 6 | 185 |
| 190-200 | 2 | 195 |
Mark the mid-points of the cost of living index on x-axis and number of weeks on the y-axis:
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