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PROBLEM 4 (3 separate mini-problems) a. Consider two different types of motors. Motor A has a...

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Mechanical Engineering

PROBLEM 4 (3 separate mini-problems) a. Consider two differenttypes of motors. Motor A has a characteristic life of (4000+YZ)hours and a shape parameter B = 0.9. Motor B has a characteristiclife of (400+YZ) hours with a shape parameter B = 2.8. Which ofthese offers better reliability for 100 hours? Which of theseoffers better reliability for 500 hours? b. Adifferent gasket (known to be at constant failure rate) has a MTBFof 10 months. 1. What is the reliability at (200+ YZ/2) days? 2.How many days does it take for the reliability to fall to a 90%level? 3. How many days does it take for the reliability to fall toa 80% level?
C. Given that a complex software system averages (10+YZ)errors per 20,000 lines of code, you are looking at managing a10,000 line program. What is the probability of exactly 0, 1, and 2errors in 10 000 lines of code? What is the probability of 2 ormore errors? Show calculations below, with answers to two decimalplaces. Probability # of errors 0 1 2. >2 100.00%

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