Question: At time t = 0, 20 identical components are tested. The lifetime distribution of each is exponential with parameter . The experimenter then leaves the

At time t = 0, 20 identical components are tested. The lifetime of each is exponential with parameter λ. The experimenter then leaves the test facility unmonitored. On his return 24 hours later, the experimenter immediately terminates the test after noticing that y = 15 of the 20 components are still in operation (so = have failed). Derive the mle of λ.

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