Answer:
18/7
Step-by-step explanation:
Note that the mean of the data is equal to (12+15+17+18+15+20+22)/7, which is 17. For each value in the data set, we then find the distance from the mean:
- |12-17|=5
- |15-17|=2
- |17-17|=0
- |18-17|=1
- |15-17|=2
- |20-17|=3
- |22-17|=5
To find the mean absolute deviation, average these distances to get 18/7.
