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 1.36. Samples 1 2 3 4 5 6 7 8 9 10 9 13 13 11 11 10 9 13 7 9 8 11 9 11 10 10 12 11 7 12 9 12 9 12 10 7 11 7 13 10 10 14 11 10 10 13 9 9 12 7 13 12 10 10 9 9 10 8 10 13 ​a) Standard deviation of the sampling means​ = . 608 ounces ​(round your response to three decimal​ places). ​b) With z​ = 3​, the control limits for the mean chart​ are: UCL Subscript x overbar ​= 12.124 ounces ​(round your response to three decimal​ places). LCL Subscript x overbar ​= 8.476 ounces ​(round your response to three decimal​ places). ​c) The control limits for the​ R-chart are: UCL Subscript Upper R ​= nothing ounces ​(round your response to three decimal​ places).