A product that is seasonally based on quarterly demand and the demand for the past three years is given below. There is no trend but there is seasonality. Average quarterly demand is 100 units. Calculate the seasonal index for the four quarters. $$\begin{array} { l l l l l }
\text { Year } & \text { Q1 } & \text { Q2 } & \text { Q3 } & \text { Q4 } \
2005 & 122 & 108 & 81 & 90 \
2006 & 130 & 100 & 73 & 96 \
2007 & 132 & 98 & 71 & 99
\end{array}$$

Question

A product that is seasonally based on quarterly demand and the demand for the past three years is given below. There is no trend but there is seasonality. Average quarterly demand is 100 units. Calculate the seasonal index for the four quarters. $$\begin{array} { l l l l l } 
\text { Year } & \text { Q1 } & \text { Q2 } & \text { Q3 } & \text { Q4 } \
2005 & 122 & 108 & 81 & 90 \
2006 & 130 & 100 & 73 & 96 \
2007 & 132 & 98 & 71 & 99
\end{array}$$

Quizplus · Accepted Answer

The Answer is Q1 128/100 = 1.28
Q2 102/100 = 1.02 Q3 75/100 = 0.75 Q4 95/100 = 0.95
Total of the seasonal indices = 4.0

A Product That Is Seasonally Based on Quarterly Demand and the Demand