Final answer:
Relative frequency is calculated by dividing the frequency of an event by the total number of data values and can be expressed in various forms including fractions, percents, or decimals. Cumulative relative frequency is the sum of relative frequencies up to the current point in the data set.
Step-by-step explanation:
The ratio of the number of times a particular event occurred to the total number of occurrences is called the relative frequency. To calculate relative frequency, you divide the frequency of the event (how many times the event occurred) by the total number of data values. This can be represented as fractions, percents, or decimals.
For example, if you want to know the relative frequency of students who study five hours or more for an exam, you would count how many students study for that length of time, which gives you the frequency. Then, you would divide this frequency by the total number of students surveyed to get the relative frequency. Adding up all the previous relative frequencies to the frequency for the current category gives you the cumulative relative frequency, which shows the accumulation of frequencies up to that point.