Question: please solve mathematically and explain. 4. Consider a product that is settled in. Its MTBF distribution has been found to be normal with a mean

please solve mathematically and explain.

4. Consider a product that is "settled in." Its MTBF distribution has been found to be normal with a mean of 15,000 hours and a standard deviation of 50 hours. What is the probability of a breakdown before 6,000 hours? Before 9,000 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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