Question

Range of data 5, 10, 15, 20 is ____.

• A. 10
• B. 15
• C. 20
• D. 5

Hint:

While the Range is easy to calculate, it only considers the two extreme values and ignores everything in between. This makes it very sensitive to "outliers" (unusually high or low numbers).

Answer 1

The Correct Option is B

Since this data set is evenly spaced, increasing by 5 each time (5, 10, 15, 20), its range can be found without hunting for the extremes separately.

There are 4 terms with a common gap of 5 between consecutive values, so the total spread from the first term to the last term covers 3 such gaps: \( 3 \times 5 = 15 \).

This matches directly subtracting the endpoints, the smallest value (5) from the largest value (20), which also gives \( 20 - 5 = 15 \).

So the correct answer is 15.