The difference between the greatest and the least values of a variable in a collection of data is called the range of the data.
For Example: In collection A, the greatest value of marks obtained is 90 while the least value of the same is 4. So, the range of the data = 90  4 = 86.
Solved Example:
The weights (in kg) of the teachers of a school are recorded as shown below.
60, 65, 63, 70, 65, 62, 65, 63, 64, 60, 68, 58, 62, 65, 63, 65, 64, 60, 62, 63
What is the range of the collection?
Answer:
Range = the greatest value of the variable in the collection  the least value of the variable in the collection
= 70  58
= 12.
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