$14\mathrm{.}4.$ The demand for a certain drug in a hospital has been increasing. For the past six months, the following demand has been observed: Use a three$-$month moving average to make a forecast for July. $14\mathrm{.}5.$ For the data in Exercise $14\mathrm{.}4,$ use an a of $0\mathrm{.}1$ to make a forecast for July. $14\mathrm{.}6.$ For the data in Exercise $14\mathrm{.}4,$ use an $\backslash$alpha of $0\mathrm{.}1$ and a $\backslash$beta of $0\mathrm{.}2$ to make a forecast for July and August. Calculate the MAD for your January through June forecasts.