Frequency tables can be used to help present sets of data. There are 4 children aged 10, which gives a total age of 40 in that category. There are 6 children aged 11, which gives a total age of 66 in ...

When class widths are not equally sized, they are called unequal class intervals. The area of the bar represents the frequency, so to find the height of the bar, divide frequency by the class width.