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 110 calls.

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 110 calls.

SAMPLE

1  

2  

3  

4  

5  

6  

7  

8  

9  

10  

11  

12  

13  

14  

15  

16  

  Number of errors

6  

3  

5  

2  

2  

6  

3  

3  

5  

10  

3  

2  

5  

4  

6  

5  

a.

Determine 95 percent limits. (Do not round your intermediate calculations. Round your final answers to 3 decimal places.)

  UCL

[removed]  

  LCL

[removed]  

b.

Is the process stable (i.e., in control)?