A light fixture contains 2 light bulbs the lifetime xi of, Ask an Expert

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A light fixture contains 2 light bulbs. The lifetime Xi of each bulb is exponentially distributed with a mean of 200 hours, i= 1,2,3. Suppose bulb lifetimes are independent from one another. Let T equal the time until a bulb in the fixture needs replacement.

a) What is the paramater Lamda of the exponential distribution?

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