Q4 An automatic machine produces 5.0 mm bolts at a high rate of speed. A quality

Question

Q4

An automatic machine produces 5.0 mm bolts at a high rate of speed. A quality control program has been started to control the number of defectives. The quality control inspector selects 50 bolts at random and determines how many are defective. The number of defectives in the first 10 samples is 3, 5, 0, 4, 1, 2, 6, 5, 7, and 7.

(a) Design a percent defective chart. Insert the mean percent defective, UCL, and LCL.

(b) Plot the percent defective for the first 10 samples on the chart.

(c) Interpret the chart.

Explanation / Answer

percent defects are

6,10,0,8,2,4,12,10,14,14

mean percent is 8

UCL - 14

LCL - 0

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