Preferably in Excel or just write formula down

The service times (in minutes) of seven customers in a bank are collected as follows: Compute the upper control limit (UCL) for X chart. (Round to 2 decimal places) 1. Compute the lower control limit (LCL) for X chart. (Round to 2 decimal places) 2. Compute the upper control limit (UCL) for MR chart. (Round to 2 decimal places) 3. Compute the lower control limit ( LCL) for MR chart. (Round to 2 decimal places) 4. If you construct the X and MR charts based on the work above, then it will suggest that the process is