If you arent sure if its correct dont answer i will thumbs down they already answered incorrect last time.

U-learn University uses a c-chart to monitor student complaints per week. Complaints have been recorded over the past ten weeks. Develop 3-sigma control limits using the following data: (If the lower control limit is negative, round the LCL to zero and all other answers to 2 decimal places, e.g. 15.25.)