A process that is considered to be in control measures an ingredient in ounces. Below are the last 10 samples (each of size n = 5) taken. The population process standard deviation is 1.20.                                                                                                                   Samples 1 2 3 4 5 6 7 8 9 10 10 10 14 10 11 11 10 12 7 9 9 10 8 9 9 11 11 16 9 11 10 11 9 12 10 9 11 7 13 10 9 10 11 11 10 11 8 11 13 8 13 10 8 11 11 9 9 7 9 12 a) Standard deviation of the sampling means = 0.537 ounces (round your response to three decimal places). b) With z = 3, the control limits for the mean chart are: