If a sample of items is taken and the mean of the sample is outside the control limits$,$ the process is:

Select one:

a$.$ within the established control limits with only natural causes of variation.

b$.$ monitored closely to see if the next sample medn will also fall outside the control limits$.$

c$.$ producing high quality products.

d$.$ likely out of control and the cause should be investigated.

e$.$ in control, but not capable of producing within the established control limits$.$