Problem 4 a) For a standard size fertilizer, which is a mixture of a variety of chemicals, the amount of a certain chemical X must be between 5 pounds and 7 pounds, for X to be effective. The population mean is 5.3 pounds, and the population standard deviation is 1.4 pounds. Calculate Cp and Cpk- b) If the transaction times for 10 consecutive customers are recorded at a bank, which control chart combination is the most appropriate one (there is only 1 correct answer): X-bar and R. charts X-bar and s charts . I and MR charts Write your final answers in the space below (Do NOT submit Excel or Minitab files for this problem): a) Cp = Cok = b) Highlight the correct answer (there is only 1 correct answer): . X-bar and R charts . X-bar and s charts . I and MR charts