Question
Draw, in the same diagram, a histogram and a frequency polygon to represent the following data which shows the monthly cost of living index of a city in a period of $2$ years:
| Cost of living inex: | $440-460$ | $460-480$ | $480-500$ | $500-520$ | $520-540$ | $540-560$ | $560-580$ | $580-600$ |
| No.of months: | $2$ | $4$ | $3$ | $5$ | $3$ | $2$ | $1$ | $4$ |
