Centerville Bikes and Stuff $($CBS$)$ sells motorcycles and accessories. The number of helmets sold by CBS per week for the past six weeks follows.

Week $123456$

Value $181214101613($b$)$

Develop the three$-$week moving average for this time series. $($Round your answers to two decimal places.$)($c$)$

Use a$=0\mathrm{.}2$ to compute the exponential smoothing values for the time series. Compute MSE. $($Round your answer to two decimal places.$)$

MSE $=$

What is the forecast for week $7?($Roun

e$)$

Use a $=0\mathrm{.}4$ to compute the exponential smoothing values for the time series.d your answer to two decimal places.$)$