Consider a Product That Is "Settled In

question 119

Essay

Consider a product that is "settled in." Its MTBF distribution has been found to be normal with a mean of 1,000 hours and a standard deviation of 250 hours. What is the probability of a breakdown before 750 hours?
Before 500 hours?
Would you prefer a policy of preventive maintenance, or a policy of breakdown maintenance, on this product?
Explain your choice.

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