Generate $4$ forecasts using the following methods: naive, simple mean method, $3$ period moving average, $2$ period weigted moving average $($with weights of $0\mathrm{.}8$ and $0\mathrm{.}2$ for the the most recent and second most recent period, respectively. What is the difference, rounded to the nearest $M$,$ between the highest forecast and the lowest forecast? For example, if your answer is $$4\mathrm{.}39$M$,$ enter $4$ in the box.$$