Mathematics
Construct a combined histogram and frequency polygon for the following frequency distribution :
| Class-intervals | 10 - 20 | 20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 |
|---|---|---|---|---|---|
| Frequency | 3 | 5 | 6 | 4 | 2 |
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Answer
Steps:
Draw a histogram for the given data.
Mark the mid-point at the top of each rectangle of the histogram drawn.
Also, mark the mid-point of the immediately lower class-interval (in the given question, the immediately lower class-interval is 0 - 10) and mid-point of the immediately higher class-interval (in the given question the immediate upper class-interval is 60 - 70).
Join the consecutive mid-points marked by straight lines to obtain the required frequency polygon.
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