Question

which data set has an outlier?
6, 13, 13, 15, 15, 18, 18, 22
4, 4, 4, 8, 9, 9, 11, 18
2, 3, 5, 7, 8, 8, 9, 10, 12, 17
3, 6, 7, 7, 8, 8, 9, 9, 9, 10

Explanation:

Step1: Define outlier

An outlier is a value far from others.

Step2: Analyze first dataset

Check 6,13,13,15,15,18,18,22.
Values cluster closely; no extreme outlier.

Step3: Analyze second dataset

Check 4,4,4,8,9,9,11,18.
18 is far from the cluster (most values ≤11).

Step4: Analyze third dataset

Check 2,3,5,7,8,8,9,10,12,17.
Values increase gradually; 17 is not extreme.

Step5: Analyze fourth dataset

Check 3,6,7,7,8,8,9,9,9,10.
Values cluster closely; no outlier.

Answer:

4, 4, 4, 8, 9, 9, 11, 18