The weekly wages (in Rs) of 40 workers in a factory are given below:
Wages (Rs): 400–450 | 450–500 | 500–550 | 550–600 | 600–650 | 650–700
Number of workers: 4 | 6 | 10 | 12 | 5 | 3
Draw a less-than cumulative frequency curve for the above data and hence estimate the median wage.