Mathematics
Construct a combined histogram and frequency polygon for the following frequency distribution :
| Class-intervals | 20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 | 60 - 70 |
|---|---|---|---|---|---|
| Frequency | 8 | 12 | 15 | 10 | 3 |
Statistics
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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 10 - 20) and mid-point of the immediately higher class-interval (in the given question the immediate upper class-interval is 70 - 80).
Join the consecutive mid-points marked by straight lines to obtain the required frequency polygon.
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