Golf Pro Shop collects data on the number of dissatisfied customers for their visits using a survey of customers conducted soon after their golf rounds are completed. Customers respond to a single question indicating on a Yes/No scale whether they were satisfied or dissatisfied with their golf rounds. The data provided below

Week	Number Dissatisfied
1	12
2	9
3	15
4	18
5	12
6	15
7	6
8	27
9	15
10	12
11	9
12	12

gives the number of dissatisfied customers noted in 150 responses each week over 12 weeks. Pro Shop Manager, has requested your help in using a control chart to assess the process. Please calculate and report what is the value of theCenter Line (only)for the Proportion (p) control chart.