Algebra-1

Question Analysis
This question tests the student's ability to calculate the range of a data set. The range is the difference between the maximum and minimum values in the data set.

Key Concept Explanation
Dispersion, or spread, measures how much the values in a data set vary from each other. The range is a simple measure of dispersion that indicates the total spread of the data.

Step-by-step Solution
1. Identify the maximum value in the data set (55).
2. Identify the minimum value in the data set (30).
3. Subtract the minimum value from the maximum value: