Answer:
Step-by-step explanation:
first of all arrange this data from ascending to descending order.
11,15,15,15,16,17,18,19,20,22,23
use formula
N+1/4 (N means no of observations)
11+1/4
12/4
3 rd term
therefore Q1=15
3.331 , 3.313 , 3.133 , 1.333
because it just is that way
P(A∪B) = 1/6 + 1/2 = 2/3