An electrical contractor's records during the last five weeks indicate the number of job requests:

$\backslash$table$[[,,,,,],[$Week:$,1,2,3,4,5],[$Requests:$,20,22,18,21,22],[,,,,,]]$

Predict the number of requests for week $6$ using each of these methods.

A$.$Naive

B$.$A four$-$period moving average. $($Round your answer to $2$ decimal places.$)$

C$.$Exponential smoothing with a$=0\mathrm{.}30.$ Use $20$ for week $2$ forecast. $($Round your intermediate calculations and final answers to $2$ decimal places.$)$