$$a$)$ The forecast for weeks $2$ through $10$ using exponential smoothing with

$(\backslash$alpha $=0\mathrm{.}60$ and a week $1$ initial forecast of $21\mathrm{.}0)$ are $?$Sales of tablet computers at Marika Gonzalez's electronics store in Washington, D$.$C$.,$ over the past $10$ weeks are shown in the table below:

a$)$ The forecast for weeks $2$ through $10$ using exponential smoothing with $=0\mathrm{.}60$ and a week $1$ initial forecast of $21\mathrm{.}0$ are $($round your responses to two decimal places$)$:

$($round your responses to two decimal$$places$)$:

b$)$ For the forecast developed using exponential smoothing $$

$(\backslash$alpha $=0\mathrm{.}60$ and initial forecast $21\mathrm{.}0),$ the MAD$=?$

$($round your response to two decimal$$places$).$

c$)$ For the forecast developed using exponential smoothing $$

$(\backslash$alpha $=0\mathrm{.}60$ and initial forecast $21\mathrm{.}0),$ the TRACKING SIGNAL $=?$

$($round your responses to two decimal$$places$)$