Question: please show math associated with the calculations Question2: Consider a product that is settled in. Its MTBF distribution has been found to be normal with

please show math associated with the calculations

Question2: Consider a product that is "settled in." Its MTBF distribution has been found to be normal with a mean of 10,000 hours and a standard deviation of 100 hours. What is the probability of a breakdown before 8,000 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. Please note that a good logical explanation is critical in this discussion

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