⟩ The “bath-tub” curve indicates failure probability. Which stage is not normally associated with the Bathtub curve?
1. “Wear-out” where failure increases due to age.
2. “Pulling the plug” where production is halted due to unacceptable level of failures
3. “Normal-life” where few failures occur
4. “Infant-mortality” where failures occur early
“Pulling the plug” where production is halted due to unacceptable level of failures