The actual and forecasted demands of a product are as follows:
|
Period |
1 |
2 |
3 |
4 |
5 |
|
Actual demand |
180 |
170 |
165 |
170 |
200 |
|
Forecasted demand |
190 |
190 |
190 |
190 |
190 |
What will be the foecast error measured in terms of mean absolute deviation (MAD)?
1
13
2
17
3
15
4
16