Please help with 10-2 and 10-3!

10-2: After a number of complaints about its directory assistance, a telephone company examined samples of calls to determine the frequency of wrong numbers given to callers. Each sample consisted of 100 samples. Is the process stable (i.e, in control)? Determine 2-sigma control limits.
Sample	Errors
1	5
2	3
3	5
4	7
5	4
6	6
7	8
8	4
9	5
10	9
11	3
12	4
13	5
14	6
15	6
16	7
17	5
18	4
19	8
20	2
10-3:
Given the following data for the number of defects per spool of cable, using three-sigma limit, is the process in control?
Compute UCL and LCL.
Observation	No. of errors
1	2
2	4
3	1
4	0
5	1
6	3
7	2
8	0
9	2
10	1
11	3
12	3
13	2
14	1
15	5