Webster Chemical Company produces tubes of mastic. Currently management is concerned that tubes are coming out that are not properly capped and sealed. If this situation worsens, it could cause numerous complaints from customers who could choose to buy the equivalent product from the competition. The tubes are packed in boxes of 144 units. Twenty (20) complete boxes were inspected to verify whether the tubes were leaking or not. The inspection result is shown in the following table:

sample	pipe with leak	Proportion of tubes with leaking	sample	pipe with leak	Proportion of tubes with leaking
1	3	0.0208	11	2	0.0139
2	5	0.0347	12	6	0.0417
3	3	0.0208	13	5	0.0347
4	4	0.0278	14	1	0.0069
5	2	0.0139	15	5	0.0347
6	4	0.0278	16	0	0.0000
7	2	0.0139	17	2	0.0139
8	6	0.0417	18	6	0.0417
9	4	0.0278	19	2	0.0139
10	9	0.0625	20	1	0.0069

Calculate the control limits for this process and assess whether Webster Chemical's capping and sealing process is in statistical control.