At ski resorts, lifts need to be reliable. Recently, one resort tested the reliability of their 20 different lifts by using a time-terminated test. The test ran for 100 hours of continuous operation
During the test, four lifts broke down, at 40, 65, 80, and 89 hours. Calculate the mean life of the lifts. If it takes on average 12 hours to repair a lift, calculate the availability of the lifts.
4
What will be an ideal response?
λ = -------------------------------------------- = 0.002
40 + 65 + 80 + 89 + 16(100)
Θ = 500 hours of average life before breakdown.
500
Availability = ----------------- = 0.977
500 + 12
The system is available 97.7% of the time.
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