You just ran 60 compressor start tests with no failures, you need to pass the consumers requirement of 85% confidence of 90% reliability. Do you meet the consumer requirements?

a) How many tests do you need to run on a pass/fail device to ensure 0.95 reliability with 90% confidence?

b) What reliability can be demonstrated with 95% confidence if you use a pass/fail device and you test it 80 times successfully?