Mean cost variance $($in control$)$ $ $4$ $ $2$

Standard deviation of cost variance $($in control$)$ $$4,832$ $$10,283$

Furthermore, the means and standard deviations of the cost variances of processes A and B$,$ when these processes are out of control, are as follows:

Process A Process B

Mean cost variance $($out of control$)$ $$6,382$ $ $6,889$

Standard deviation of cost variance $($out of control$)$ $$4,832$ $$10,283$