2. The box plot of monthly income of 280 randomly selected students is displayed
below:
500
1200
(a) (2 points) Find its IQR.
1800
3000
Q3-Q1=3000-1200 = 1800
4000
(b) (2 points) How many students had a monthly income below $3000?
(a) (800
(c) (3 points) Find the upper and the lower fence.
upper = 3000+ 1.5 (100) = 5700
Lower 1200-1.5 (1800)= -1500
(b)
(c)
upper lence=5700
Lover tence=1500