a$.$ Forecast September sales volume using each of the following:

$(1)$ The naive approach.

Naive approach

thousands

$(2)$ A five$-$month moving average. $($Round your answer to $2$ decimal places.$)$

Moving average

thousands

$(3)$ A weighted average using $0\mathrm{.}60$ for August, $0\mathrm{.}10$ for July, and $0\mathrm{.}30$ for June. $($Round your answer to $2$ decimal places.$)$