Business Statistics

Chapter 17 | Statistical Quality Control 673

Sampled watches Number of defects

26 2

27 1

28 0

29 2

30 3

8.

The quality control officer of “Fresh water”, a mineral water

company has taken a random sample of 30 cartons and exam-

ined all the bottles in the selected cartons for defects. The num-

ber of bottles that did not conform to quality standards are given

in the table below. Use the data to construct a c chart.

Carton number Number of non-conformance

1 2

2 1

3 3

4 4

5 2

6 1

7 0

8 2

9 3

Carton number Number of non-conforming

bottles

10 1

11 1

12 1

13 2

14 3

15 0

16 1

17 1

18 3

19 3

20 2

21 1

22 3

23 2

24 3

25 2

26 2

27 2

28 1

29 3

30 2

formUlaS |

x

Chart:

Control limit considering ...