A manager has to develop a control chart for determining whether three homogenous processes are in control. Accordingly, she sampled four units of output from each process, with the following results: Process 1- 17, 15, 15, 17; Process 2- 16, 25, 18, 25; Process 3-23, 24, 23, 22. For upper and lower control limits of 23.29 and 16.71 , which process(s), if any, appear(s) to have an out-of-control process mean? 22 and 18 23.29 and 16.71 23.5 and 16.5 23.16 and 16.84 24.1 and 15.75