21. The hourly wages of a group of workers has median $ 21, the rst quartile $17 and

third quartile $ 27. The four lowest paid workers had wages $4, $5, $8, $9, and the

three highest paid workers had wages $29, $32, $33. Based on the 1:5IQR rule, how

many outliers are there in this data set of hourly wages?

(a) no outliers

(b) only one outlier

(c) only two outliers

(d) only three outliers

(e) more than three outliers