Consider the Following Data -Consider the Data Given Above and Calculate S₃ Using Simple

Consider the following data:
$$\begin{array} { c c } \text { Time } & \text { Demand } \\1 & 17 \\2 & 21 \\3 & 19 \\4 & 23 \\5 & 18 \\6 & 16 \\7 & 20 \\8 & 18 \\9 & 22 \\10 & 20 \\11 & 15 \\12 & 22\end{array}$$
-Consider the data given above and calculate S₃ using simple exponential smoothing if S₁ = 18.6 and a = 0.2.