The Chair of the Operations Management Department at Quality University wants to construct a pchart for determining whether the four faculties teaching the basic P/OM course are under control with regard to the number of students who fail the course. Accordingly, he sampled 200 final grades from last year for each instructor, with the following results: (Do not round intermediate calculations. Round our answers to three decimal places) Number of Failures _ _ _ a. What is the sample proportion of failures (p) for Prof. D? b. What are the upper and lower control limits for the p-chart (2:3)? 0. If any. should he conclude is (are) out of control