Find the range of the following set of numbers: 28, 29, 39, 38, 33, 37, 26, 20, 15, and 25.

Analyze the question: The range of a data set is the difference between the largest value and the smallest value.

Concept: Range = Highest value − Lowest value

Solution:

Step 1: List the numbers: 28, 29, 39, 38, 33, 37, 26, 20, 15, 25

Step 2: Arrange in order (optional, but it helps avoid mistakes): 15, 20, 25, 26, 28, 29, 33, 37, 38, 39

Step 3: Identify the extremes:

• Highest = 39
• Lowest = 15

Step 4: Calculate: Range = 39 − 15 = 24

Answer: Option B (24).

Tip: Scan the list once for the biggest and smallest numbers, then subtract. Be careful not to pick a number like 20 as the smallest just because it appears near the end. Always check the whole list. Also, don't confuse range with the median or the mean, which need more steps.