Question: Please round your calculations to the nearest ten-thousandth) A customer service helpline takes calls each day. Each day, 1000 calls at random are selected to

Please round your calculations to the nearest ten-thousandth) A customer service helpline takes calls each day. Each day, 1000 calls at random are selected to see if the customer was satisfied with the result; these measurements are taken over the course of twelve days. The resulting percentages of customers not satisfied:

Chart of Percentage Error for Service Calls
Day Percentage Error
1 0.012
2 0.003
3 0.011
4 0.006
5 0.005
6 0.006
7 0.001
8 0.005
9 0.001
10 0.016
11 0.005
12 0.007

If we assume a z-value of z=3, what is the upper control limit of our p-chart?:

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