A Nevada Bank keeps track of errors from 20 clerks. Each sample has 100 records. They want to construct a P-chart to track the proportion of errors in each sample. The table below shows the number of errors per sample. (Use z = 3 for control limit calculations.)

Sample	Errors	Sample	Errors	Sample	Errors
1	6	8	6	15	5
2	5	9	4	16	1
3	3	10	9	17	2
4	4	11	2	18	6
5	5	12	6	19	2
6	4	13	5	20	7
7	2	14	4	TOTAL	88

1. Determine .
2. Determine _P.
3. Determine the 3-sigma UCL and LCL.
4. Does the process appear to be in statistical control?