For the time series above, using exponential smoothing with smoothing constant $=0\mathrm{.}3$ to forecast Week $5$

sales, we get:

$9\mathrm{.}95$

$8\mathrm{.}8$

$11\mathrm{.}21$

$9\mathrm{.}16$

$8\mathrm{.}2$