Question: For 3 0 - 3 1 : Thad's Dry Cleaning is trying to improve its image with its customers. Part of this program involves providing

For 30-31: Thad's Dry Cleaning is trying to improve its image with its customers. Part of this program involves providing excellent customer service along with on-time cleaning. A questionnaire accompanies each order asking the customer, among other things, whether they are satisfied or unsatisfied with the service. One hundred customers were sampled on each of the last seven days. The results are as follows:
What are the control chart upper and lower control limits for two-sigma control limits?
Group of answer choices
0.128 & 0.065
0.143 & 0.031
0.169 & 0.005
0.170 & 0.003

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