Question $12$

The department manager using a combination of methods has forecast sal toasters at a local department store. Calculate the MAD for the manager's forecast and report it to $1$ decimal place.

$\backslash$table$[[$Month$,$Unit Sales,Manager's$],[$January$,52,$Forecast$],[$February$,61,],[$March$,73,],[$April$,79,],[$May$,66,],[$June$,51,],[$July$,47,50],[$August$,44,50],[$September$,30,52],[$October$,55,55],[$Dovember$,74,50]]$