Question: 2. A Quality Analyst wants to construct a control chart for determining whether the four machines are under control or not, by checking the total

2. A Quality Analyst wants to construct a control chart for determining whether the four machines are under control or not, by checking the total defectives in the output. Accordingly, he inspected 1,000 units of output from each machine in random samples, with the following results: Machine # of defectives 1 23 2 15 3 29 4 13 Find: a. The average of sample proportions of defectives? b. The standard deviation of the sampling distribution

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