Question: PLease answer only part 3 and use YZ = 06 (Non-repairable) electrical transformers were tested with a special apparatus for 1500 hours. This 1500 hour

PLease answer only part 3 and use YZ = 06

(Non-repairable) electrical transformers were tested with a special apparatus for 1500 hours. This 1500 hour ideal life corresponds to a 97% reliability with 95% confidence. (Yes, this is quite HIGH confidence) (3 marks) What is the required sample size required to ensure that this 97% reliability and 95% confidence is met? Will a testing rack with space for ( 75+ YZ) pieces be adequate? What is the required sample size required to ensure that this 97% reliability but ONLY 50% confidence? (2 marks) Due to ill-advised cutbacks, the new rack only has room for 50 pieces. You want to ensure the same 97% reliability. What is your confidence level? (2 marks) More cutbacks from the ill-informed! Now, apparently the test needs to be shortened, from 1500hrs, to (900+YZ) hours, but you are determined to hold the 97% reliability level with only 50 samples. What is your confidence level now? Try using C=1R(NL) and note that the Weibull slope for these transformers is 2.25

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