Question

The following data shows the annual rainfall amounts for Albuquerque over the past ten years. Which of these values should be considered outliers?

Precipitation (inches): 9.4, 9.1, 9.8, 10.9, 9.2, 10.7, 9.1, 8.1, 9.1, 9.4

A. 8.1
B. 10.9
C. 8.1 and 10.9
D. None of the above

Answer 1

Precipitation (inches): 9.4, 9.1, 9.8, 10.9, 9.2, 10.7, 9.1, 8.1, 9.1, 9.4

Arrange in ascending order:
8.1, 9.1, 9.1, 9.1, 9.2, 9.4, 9.4, 9.8, 10.7, 10.9

The outlier is 10.9

Mean = 9.48
Median = 9.3
Q1 = 9.1
Q3 = 9.8
IQR = 0.7
Lower fence: 8.05
Upper fence: 10.85