Passenger miles flown on Northeast Airlines, a commuter firm serving the Boston hub, are shown for the past $12$ ?weeks:

a $)$ ?Assuming an initial forecast for week $1$ ?of $16,000$ ?miles, use exponential smoothing to compute miles for weeks $2$

through $12.$ ?Use $?=0\mathrm{.}22($ round your responses to two decimal places $).$ ?b $)$ ?what is the mad?