Judy Holmes Textiles has decided to use a c-Chart to monitor the number of defec

Question

Judy Holmes Textiles has decided to use a c-Chart to monitor the number of defects p pair of jeans produced by their manufacturing process. The c-Chart should constructed using ±3 standard deviations from the mean. The operations manag randomly samples one pair of jeans at 10 successively selected time periods and co the number of defects on the pair of jeans. Data shown below. TOTAL DEFECTS = 50 un Sample: 1 2 3 4 5 7 8 9 10 Defects 4 7 6 7 9 5 7 10 5 4. The Lower Control Limit for this Control Chart is? a. 11.24 b. 6.48 C. 5.00 d. 0.00 5. The number of observations that are out of control is? b. 1 C. 2 d. > 2

Explanation / Answer

4) here average number of defects per sample =50/10=5

hence lower control limt =5 -3*(5)1/2 = 0.0000 (as number of defects can not be negative)

option D is correct

5)

upper limit =5+3*(5)1/2 =11.71

as all defects lie between control limits 0 and 11.71 therfore option A is correct

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