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A machine has two independent cutting parts (Weibull Distribution). Any one of these cutting parts is...

A machine has two independent cutting parts (Weibull Distribution). Any one of these cutting parts is sufficient to operate the machine. The hazard rates for the two parts of this machine are constant and they are 0.001 and 0.0015 failures per hour. Calculate:

1. The survival probability of the machine at 300 hour of running time?

2. The mean time to failure for this machine?   

Math   Statistics-And-Probability   
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