12...A shirt manufacturer buys cloth by the 100-yard roll from a supplier. For setting up a control chart to manage the irregularities (e.g., loose threads and tears), the following data were collected from a sample provided by the supplier.

SAMPLE IRREGULARITIES

1 2

2 4

3 5

4 3

5 4

6 6

7 5

8 6

9 4

10 3

a.Determine thec ,S_p,UCL and LCL for ac-chart withz= 2.(Leave no cells blank. Round up any negative LCL value to "0". Round your answers to 2 decimal places.)

b.Suppose the next five rolls from the supplier had two, four, four, three, and seven irregularities. Is the supplier process under control?

yes or no ?