MONTH	Actual shed sale	4 month moving averge
JAN	10
FEB	12
MAR	13
APR	16
MAY	19
JUN	23
JUL	26
AUG	30
SEP	28
OCT	18
NOV	16
DEC	14
JAN	-

A. Develop a four-month moving average forecast for Wallace Garden Supply and compute the MAD.

B. The four-month moving average forecast for Wallace Garden Supply is ___________. (Please round it to an integer and include no units.)

a:17, b: 18, c: 19, d: 20

C. The Mean Absolute Deviation (MAD) for the above forecast is . (Please round it to two decimal points.)