Fifty sampling units of equal size were inspected, and the number of nonconforming situations was recorded. The total number of instances was 353. Complete parts a through c. a. Determine the appropriate control chart to use for this process. Choose the correct answer below. x-chart Both an R-chart and an x-chart p-chart R-chart c-chart b. Compute the mean value for the control chart. The mean is (Round to three decimal places as needed.) c. Compute the upper and lower control limits. UCL = LCL = (Round to three decimal places as needed.)