The average time to handle a call in the Call$-$Nowait call processing center has a specification of $6\backslash$pm $1\mathrm{.}25$ minutes. The loss from a mishandled call is $$12.$ A sample of $25$ calls was drawn from the process and the results, in minutes, can be found in the worksheet tab Prob$08-12$ in the Excel file Ch$08$Data.xlsx$.$a$.$ Compute the value of k in the Taguchi loss function.