Answer:
C is the correct answer.
Explanation:
given: 12, 39, 21, 18, 24, 17, 12, 25
arrange them in increasing order:
12, 12, 17, 18, 21, 24, 25, 39
solve:
outlier refers to the unit which is minimum or maximum unit in the data.
Here outlier: 39
mean with the outlier:
(sum of units)/(total number) = (168)/(8) = 21
mean without outlier:
(sum of units-39)/(total number) = (168-39)/(7) = 18.4