Represent the following data using histogram and hence draw frequency polygon: No. of words typed per minute 30 – 39 40 – 49 50 – 59 60 – 69 70 – 79 No. of typists 2 8 15 12 3

4. Represent the following data using histogram and hence draw frequency polygon:

No. of words typed per minute	30 – 39	40 – 49	50 – 59	60 – 69	70 – 79
No. of typists	2	8	15	12	3

Solution:

No of words typed per minute (Class interval)	Extended Class	No. of typists
20 - 29	19.5 – 29.5	0
30 – 39	29.5 – 39.5	2
40 – 49	39.5 – 49.5	8
50 – 59	49.5 – 59.5	15
60 – 69	59.5 – 69.5	12
70 – 79	69.5 – 79.5	3
80 – 89	79.5 – 89.5	0