A plot of the points (x,f), where x represents the class mark of a given class in a frequency distribution and f represents its frequency, is called a frequency polygon. Construct a frequency polygon using the data in Exercise 116.
Exercise:
Eighty pilots were tested in a flight simulator and the time for each to take corrective action for a given emergency was measured in seconds, with the following results:
![](https://test.transtutors.com/qimg/58f30542-198a-4af7-9e6f-333de584d686.png)
Construct a frequency distribution of these data.