中等MATH-STAT-002
For the data 3, 5, 7, 8, 20, which measure is most affected by the extreme value 20?
A. The median
B. The range and the median equally
C. The mean✓ 答案
D. The interquartile range
解說
The mean uses every value, so replacing a typical observation by 20 pulls it upwards. The median of this ordered list stays at 7. The interquartile range also resists a single outlier better than the mean does.