4. A submarine has three navigational devices but can remain at sea if at least two are working. Suppose that the failure times are exponential
4. A submarine has three navigational devices but can remain at sea if at least two are working. Suppose that the failure times are exponential with means 1 year, 1.5 years, and 3 years. Formulate a Markov chain with states 0 = all parts working, 1, 2, 3 = one part failed, and 4 2 two failures. Compute E0T4 to determine the average length of time the boat can remain at sea
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