Frequency Polygon
Frequency Polygon
Frequency Polygon:
It is another method of representing frequency distributions graphically. Also, it is used to represent classified or grouped data graphically. It is a line graph of grouped frequency distribution plotted between class marks and frequencies. It can be obtained in two ways
Steps of Drawing Drawing Frequency Polygon (By First Drawing Histogram) :
Illustration : Draw a histogram and a frequency polygon of the following data :
| Age in years | 0-6 | 6-12 | 12-18 | 18-24 | 24-30 | 30-36 | 36-42 |
|---|---|---|---|---|---|---|---|
| No. of persons | 6 | 11 | 25 | 35 | 18 | 12 | 6 |
Solution : First we draw histogram of the given data, then we will locate mid-point of top horizontal side of rectangles.
Now, join these mid points by dotted line segments. Complete the polygon by joining the mid points of first interval to the mid-point of its left adjacent assumed class interval of zero frequency and mid-point of last class interval to its adjacent right assumed class interval of zero frequency.
A frequency polygon is a closed figure which is ___________ | |||
| Right Option : D | |||
| View Explanation | |||
If the weight range for a class of 45 students is distributed by 35 - 45, 45 - 55, 55 - 65, 65 - 75. What would be the class marks for each weight range ? | |||
| Right Option : A | |||
| View Explanation | |||
A frequency polygon is a many sided __________________________ | |||
| Right Option : B | |||
| View Explanation | |||
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