Cumulative Frequency Distribution

A cumulative frequency distribution is another type of frequency distribution. Instead of reporting how many data values fall in some classes, it reports how many data values are contained in either that class or any class to its left. Technically, it means the sum of frequencies of the class and all the classes below it in a frequency distribut...

Consider a frequency distribution of customers who bought cameras at different price ranges. The table shows that three customers bought cameras that cost from 40 to 59 dollars.

To find out how many customers bought cameras that cost less than 60 dollars, calculate the cumulative frequency for the first two classes. It is given by the sum...