Question: Explain carefully how redundancy improves product reliability. (5 marks) b) Ten high-intensity bulbs are tested for 100 hours each. One failed at 50 hours, another

Explain carefully how redundancy improves product reliability. (5 marks) b) Ten high-intensity bulbs are tested for 100 hours each. One failed at 50 hours, another failed at 70 hours and all others completed the test. Calculate FRCS), FR(N), and MTBF (5 marks c) Great Southern Consultants Group's computer system has been down several times over the past few months, as shown below. Number of breakdowns | Monthly frequency 0 8 1 2 23 3 4 4 1 Each time the system is down, the firm loses an average of $400 in time and service expenses. They are considering signing a contract for preventive maintenance. With preventive maintenance, the system would be down on average only 0.7 per month. The monthly cost of preventive maintenance would be $250 a month. Which is cheaper, breakdown or preventive maintenance? (10 marks) d) Determine the reliability for the system shown below: (5 marks) R1 R2 R3 .90 .80 .99 I .80

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