Answer:
Step-by-step explanation:
first arrange the data from ascending to descending order.
11 , 12 , 15 , 17 , 19 , 20 , 21 , 22
Median(Q2)=(N+1)/2
=8+1/2
=9/2
=4.5 th term
=(4 th term + 5 th term)/2
=(17+19)/2
=36/2
=18
therefore the median of the set of data is 18.
