Draw a cumulative frequency curve and cumulative frequency polygon for the
following frequency distribution by less than method.
Age (in years): 0-9 10 - 19 20 - 29 30 - 39 40 - 49 50 - 59 60 - 69
No. of Persons: 5 15 20 23 17 11 9
Answers
Answer:
The given frequency distribution is not continuous. So, we first make it continuous and prepare the cumulative frequency distribution as under.
Age (in years) Frequency Age less than Cumulative frequency
-0.5-9.5 5 9.5 5
9.5-19.5 15 19.5 20
19.5-29.5 20 29.5 40
29.5-39.5 23 39.5 63
39.5-49.5 17 49.5 80
49.5-59.5 11 59.5 91
59.5-69.5 9 69.5 100
Now, we plot points (9.5,5),(19.5),(29.5,40),(39.5,63),(49.5,80),(59.5,91)and(69.5,100). and join them by a free hand smooth curve to obtain the required ogive as shown in Fig. 7.5.
The cumulative frequency polygon is obtained by joining these points by line segments as shown in Fig. 7.6.
solution
Step-by-step explanation:
THIS IS THE STEP-BY-STEP EXPLANATION
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Answer:
Age no. of persons. c.f
0- 9.5 5. 5
9.5 - 19.5 15. 20
19.5 - 29.5. 20. 40
29.5 - 39.5. 23 63
39.5. - 49.5. 17. 80
49.5 - 59.5. 11. 91
59.5 - 69.5. 9. 100
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