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



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