Phantom Controls monitors and repairs control cir- cuit boxes on elevators installed in multistory buildings in down- town Chicago. The company has the contract for 108 buildings. When a box malfunctions, Phantom installs a new one and rebuilds the failed unit in its repair facility in Gary, Indiana. The data for failed boxes over the last 2 years is shown in the follow- ing table:

Simulate 2 years (24 months) of operation for Phantom and deter- mine the average number of failed boxes per month from the sim- ulation. Was it common to have fewer than 7 failures over 3 months of operation? (Start your simulation at the top of the 10th column of Table F4 on page 821, RN = 37, and go down in the table.)