A sample of 5 boxes was selected from a process each day for 12 days. The weight of each box (in ounces), along with the sample range and mean are shown below:

Day	Box1	Box2	Box3	Box4	Box5	Range	Mean
1	27	31	30	30	33	6	30.2
2	29	34	34	32	32	5	32.2
3	31	29	28	28	27	4	28.6
4	34	29	28	33	31	6	31.0
5	29	27	28	27	32	5	28.6
6	34	33	30	32	32	4	32.2
7	32	28	28	30	34	6	30.4
8	33	33	31	28	33	5	31.6
9	27	31	32	32	28	5	30.0
10	30	32	32	33	31	3	31.6
11	27	30	27	27	30	3	28.2
12	27	28	30	28	31	4	28.8

Determine the control limits for the RR-chart accurate to 2 decimal places.

Table of Control Chart Constants

a) Centreline =

b) LCL = UCL =

c) Based on these results, is the process variation in control?

• No. There is at least one point beyond the control limits.
• No. There is no point beyond the control limits.
• Yes. There is a point beyond the control limits.
• Yes. There is no point beyond the control limits.