28.

Given the following data, ifMAD= 3.25, determine what the actual demand must have been in time period #2?

Time Period	Actual Demand	Forecast Demand
1	11	13
2	?	15
3	16	14
4	15	18

Select one:

a. 11 or 19

b. 10 or 20

c. 9 or 21

d. 13 or 17

e. 12 or 18