An extreme outlier is any observation that is Farther than 1

An extreme outlier is any observation that is: Farther than 1.5 fourth spreads from the closest fourth Farther than 3 fourth spreads from the closest fourth Farther than 1.5 fourth spreads from the median Farther than 3 fourth spreads from the median

Solution

An outlier is

OPTION B: Farther than 3 fourth spreads from the closest fourth

[This is equivalent to 1.5 IQRs from the closest fourth]