: Five samples with four observations each have been taken with mean and range of the actual measurements (in inches) shown in Table below: (15 point)

Sample	1	2	3	4	5
Mean	12.5	12.4	12.24	11.9	12.08
Range	0.3	0.32	0.25	0.4	0.35

Construct a mean and range chart and indicate whether the process is in control? (Note: This specifically means you need to draw the mean and range charts and identify whether the process is in control)

(Point scale: 4 points for LCL and UCL, 5 points for mean chart and 5 points range chart, 1 point to determine process is in control or not)