For the stable demand item in the Table, forecast at week $10$ using

Na$$ve method

Four period moving average

Three period weighted moving average using weights of

$0\mathrm{.}6,0\mathrm{.}3,$ and $0\mathrm{.}1$ in the descending order of recent periods

Exponential smoothing using $=0\mathrm{.}7$ assuming the forecast at Week $9$ was $120$