a$)$ Prepare a forecast through week $11$ by using a five $$week moving average

b$)$ Prepare a forecast through week $11$ by using a $3-$period weighted moving average, giving the weight of $0\mathrm{.}5$ to the most recent week, $0\mathrm{.}3$ to the second week and $0\mathrm{.}2$ to the third week.

c$)$ Prepare a forecast using exponential smoothing method with $\backslash$alpha $=0\mathrm{.}2.$ Forecast for week $1$ was $22.$

Prepare a forecast through week $11$ by using a regression model Y$=26\mathrm{.}33+0\mathrm{.}3212$X