B$-$B$-$Q$-$King Drive$-$In Restaurant is considering a new marketing idea. At B$-$B$-$Q King,

diners have the choice of dining inside or staying in their cars to eat. To serve those

dining in their cars, carhops take the orders at the car and bring the food to the car when

it's ready. Many people want fast service when they pull into the drive$-$in restaurant,

but they also want more than a drive$-$through restaurant can offer. To try to meet their

customers' expectations, B$-$B$-$Q$-$King Drive$-$In is proposing to promise to have a server

at your car in two minutes with maximum one minute early or delay after your arrival

at their drive$-$in$.$ The current time for servers to reach the cars is given in the table below.

Calculate the range for each of the subgroups containing five server times. Since the

owners of B$-$B$-$Q$-$King Drive$-$In are interested in the combined performance of their

servers and not the performance of any particular server, the subgroups contain times

from each server. Use these calculated values to determine the process capability and

the Cp and Cpk values. How well is the process performing when compared with the

specifications promised to the customers? If the process is not performing as desired,

advise the restaurant on how they can achieve the specifications required.