1
Step-by-step explanation:
Here are the steps
1 Find the mean of the data set
2 Subtract the mean from each value ( ignore the minus signs ), that is the distance of each value from the mean
3. Find the mean of 2
mean =
=
= 7
value  distance
 9    | 9 - 7 | = 2
  7    | 7 - 7  | = 0
  6    | 6 - 7 | = 1
  8    | 8 - 7 | = 1
  7    | 7 - 7 | = 0
  5    | 5 - 7 | = 2
Find the mean of these values
mean absolute deviation =
= 1