Answer:a
Explanation:
mean=(22+8+10+18+12+20) ➗ 6
mean=90 ➗ 6
mean=15
To get there median we first arrange in ascending order of magnitude
8,10,12,18,20,22
We have two numbers (12,18) at the middle
We find the mean Of The two middle number.the mean Of The two middle number is our median
(12+18) ➗ 2
30 ➗ 2=15
Median=15
Difference between mean and median is 15-15=0