2. Describe the three phases of the life cycle curve Draw the curve and label it in detail (the
axes, phases, type of product failure, etc)

3. Determine the failure rate for the following You have tested circuit boards for failures
during a 500-hour continuous use test Four of the 25 board s failed The first board failed
in 80 hours, the second failed in 150 hours, the third failed in 350 hours the fourth in
465 hours The other boards completed the 500 hour test satisfactorily What is the mean
life of the product?