The intensive care unit lab process has an average

turnaround time of $26\mathrm{.}2$ minutes and a standard

deviation of $1\mathrm{.}35$ minutes. The target value for

this service is $25$ minutes with an upper

specification limit $($USL$)$ of $30$ minutes and a

lower specification limit $($LSL$)$ of $20$ minutes.

The administrator of the lab wants to have four sigma performance for her lab. Is the lab process

capable of this level of performance?