Problem $3-2($Algo$)$ Naive MA WMA

National Scan, Inc., sells radio frequency inventory tags. Monthly sales for a seven$-$month period were as follows:

Month Sales

$(000)$Units

Feb. $16$

Mar. $18$

Apr. $13$

May. $20$

Jun. $22$

Jul. $23$

Aug. $28$

Click here for the Excel Data File

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

$(1)$ The naive approach.

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

$(3)$ A weighted average using $0\mathrm{.}75$ for August, $0\mathrm{.}15$ for July, and $0\mathrm{.}10$ for June. $($Round your answer to $2$ decimal places.$)$