1. Inspectors want to develop process control charts to check the weights of cartons of Plaster of Paris. They take ten samples of seven boxes each and weigh them. Based on the following data, compute the lower and upper control limits for both x-bar and R-charts. Determine whether the process is in control.

Sample	Mean	Range
1	33.8	1.1
2	34.6	0.3
3	34.7	0.4
4	34.1	0.7
5	34.2	0.3
6	34.3	0.4
7	33.9	0.5
8	34.1	0.8
9	34.2	0.4
10	34.4	0.3