A frequency polygon for the times taken by 18 people to complete a puzzle is shown in the image attached below.
How to draw a frequency polygon?
In order to draw a frequency polygon for the given data, we would construct a frequency table as follows:
Time, t minutes                    Frequency
0 < t ≤ 10                             5
10 < t ≤ 20                            5
20 < t ≤ 30                            7
30 < t ≤ 40                            1
Next, we would determine the midpoint of the data set:
- 10 < t < 20 = (10 + 20)/2 = 15.
- 20 < t < 30 = (20 + 30)/2 = 25.
- 30 < t < 40 = (30 + 40)/2 = 35.
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