The number of customers who are not satisfied with the service provided in a retail store is found for 20 samples of size 100 and is shown in Table. Obtain the control chart limits for the proportion of dissatisfied customers. Assume that for points outside the control limits, there are no special causes.If the process proportion of dissatisfied customers were to rise to 7%, what is the probability of not detecting this shift on the first sample drawn after the change has taken place?

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