Question

Construct a histogram and then a frequency polygon for the following frequency distribution.

Class Interval	100-150	150-200	200-250	250-300	300-350
Frequency	10	15	17	12	10

Answer 1

Steps : 

1. On the x-axis, take 1 cm as 5 units and plot class interval.

2. On the y-axis , take 1 cm as 5 units and plot frequency .

3. Draw rectangles of histogram as per given data .

4. For each rectangle , mark the midpoint of its length at the top part . In this case , points are (125.10),(175,15),(225,17),(275,12),(325,10).

5. Mark two more midpoints of Zero frequency on x-axis  at the start and at th end .

6. Now connect the points using straight lines.

Class Interval	Frequency
100-150	10
150-200	15
200-250	17
250-300	12
300-350	10