Problem $3$

$3$ points

Given the following history, use a three$-$quarter moving average to forecast the demand for the third quarter of this year.

Note, the $1$st quarter is Jan, Feb, and Mar, $2$nd quarter Apr, May, Jun; $3$rd quarter Jul, Aug, Sep; and $4$th quarter Oct, Nov, Dec.

$\backslash$table$[[,$Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec$],[$Last year,$100,125,135,175,185,200,150,140,130,215,230,275],[$This year,$130,145,145,170,185,200,,,,,,]]$