Phantom Controls monitors and repairs control circuit boxes on elevators installed in multistory buildings in downtown 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 date for failed boxes over the last 2 years is shown in the following table:

Number of Failed Boxes per Month	Probability
0	0.10
1	0.14
2	0.26
3	0.20
4	0.18
5	0.12

Simulate 2 years (24 months) of operation for Phantom and determine the average number of failed boxes per month from the simulation. 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 F.4 on page 795, RN = 37, and go down in the table.)

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