Question: Airline ABC has 25 planes. Planes break down an average of three times a year and take one week to fix. Assuming that breakdowns are

Airline ABC has 25 planes. Planes break down an average of three times a year and take one week to fix. Assuming that breakdowns are poissson distrubuted and repair time exponentially distributed how many repair crews are needed to ensure that there is at least a 96% chance that 21 or more planes are available? Each repair crew can work at only one plane at the same time and broken down planes wait in a single queue for the next available repair crew. What is the average utilization of the repair crew and how many planes are on average grounded (i.e., unable to fly)?

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