The monthly sales for Telco $$Batteries$,$ Inc., were as follows.

$$

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sept

Oct

Nov

Dec

Sales

$20$

$20$

$16$

$15$

$11$

$15$

$17$

$19$

$20$

$22$

$21$

$22$

This exercise contains only parts b and c$.$

Part $2$

$$b$)$ The forecast for the next month$($Jan$)$ using the naive methodLOADING...equals

$$

$20$ sales. $($Round your response to a whole$$ number.$)$