a$.$ Plot the above data on a graph. Do you observe any trend, cycles, or random variations? b $.$ Starting in year $4$ and going to year $12,$ forecast demand using a $3-$year moving average $.$ Plot your forecast on the same graph as the original data. c $.$ Starting in year $4$ and going to year $12,$ forecast demand using a $3-$ year moving average with weights of $\mathrm{.}1,\mathrm{.}3,$ and $\mathrm{.}6,$ using $\mathrm{.}6$ for the most recent year. Plot this forecast on the same graph $.$