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 = 88 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 |
= |
sec |
LCL |
= |
sec |
UCL |
= |
sec |
