How to Find the Range from a Frequency Table (Mathematics Lesson)
Finding the Range from a Frequency TableWe can find the range of a set of numbers presented in a frequency table.
How to Find the Range from a Frequency TableFinding the range from a frequency table is easy.
An Example QuestionThe frequency table below shows the test scores for a class of students.
What is the range of the test scores?
In our example, the lowest entry is 5. The lowest test score is 5.
In our example, the highest entry is 10. The highest test score is 10.
10 - 5 = 5The range of the test scores is 5.
A Real Example of How to Find the RangeThe slider below gives another example of finding the range from a frequency table.
Here's a second test on finding the range from a frequency table.
Here's a third test on finding the range from a frequency table.
Make Sure the Numbers Are in OrderMake sure the numbers in the left most column are in order.
Don't forget: The whole row, not just that in the first column, needs to be rearranged. Each number in the Frequency column corresponds to the Number to its left.
Careful of 0 FrequenciesWhat is the range of the frequency table below?
It is tempting to think that it is:
Range = 4 - 1 = 3However, Number 1 and 4 have a Frequency of 0. That means there is actually no 1 and 4 in the set of numbers. Just ignore any row with a Frequency of 0.
The true range is:
Range = 3 - 2 = 1