Suppose a Penny Arcade Worker Is in Charge of Keeping

question 2

Multiple Choice

Suppose a penny arcade worker is in charge of keeping ten machines in operation.The failure rate of each machine follows an exponential distribution with a mean time of ten hours and the time required to repair each machine follows an exponential distribution with a mean time of thirty minutes.Over the long run, approximately what percentage of machines, on average, will be operating?

• A)76.5%
• B)92.4%
• C)53.8%
• D)46.2%