Assertion (a): In case of control charts for variables if some points fall outside the control limits it is concluded that the process is not under control
Reason(R): It was experimentally proved by shewhart that averages of four or more consecutive readings from a universe (population) or from a process when plotted will form a normal distribution curve
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true