You are given the following data:

$($a$)$ Predict sales for July using:

$($i$)2$ months simple moving average.

$($ii$)3$ months weighted moving average of $0\mathrm{.}5,0\mathrm{.}3$ and $0\mathrm{.}2.$

$[4$ marks$]$

$($iii$)$ Distinguish between stability and responsiveness in forecasting.