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On average a certain kind of kitchen appliance requires repairs

On average, a certain kind of kitchen appliance requires repairs once every four years. Assume that the times between repairs are exponentially distributed. In addition to providing the answer, state the relevant Excel commands.

a. What is the probability that the appliance will work no more than three years without requiring repairs?

b. What is the probability that the appliance will work at least six years without requiring repairs?

a. What is the probability that the appliance will work no more than three years without requiring repairs?

b. What is the probability that the appliance will work at least six years without requiring repairs?

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