Five data entry operators work at the data processing department of the Birmingham Bank. Each day for 30 days, the number of defective records in a sample of 250 records typed by these operators has been noted, as follows:

Sample No.	No. Defectives	Sample No.	No. Defectives	Sample No.	No. Defectives
1	6	11	7	21	16
2	4	12	6	22	13
3	18	13	15	23	6
4	10	14	3	24	7
5	10	15	10	25	12
6	7	16	8	26	9
7	11	17	12	27	15
8	8	18	3	28	5
9	5	19	17	29	13
10	14	20	15	30	4

a) Establish 3 upper and lower control limits:

UCLp = (enter your response as a number between 0 and 1, rounded to three decimal places).

LCLp = (enter your response as a number between 0 and 1, rounded to three decimal places).

b) Why can the lower control limit not be a negative number?

A. Since the percent of defective records is always a positive number.

B. Since the upper control limit cannot be a negative number.

C. Since the upper control limit is positive.

D. Since the percent of defective records cannot be a negative umber.