A sandwich shop owner takes a daily sample of seven consecutive sandwich orders at a random time during the lunch rush and records the time it takes to complete each order. Past experience indicates that the process mean should be μ = 86 seconds, and the process standard deviation should be σ = 22 seconds.
Calculate the center line and control limits for an x control chart. (Round your answers to two decimal places.)
CL = 86 sec
LCL = _____sec
UCL = _____sec