📚 Concept Review
Weekend review time — let's revisit a core idea in I. Reliability Fundamentals.
A batch of LED drivers has a mean time between failures \(MTBF\) of 50,000 hours under continuous operation. Assuming a constant failure rate \(exponential distribution\), what is the approximate failure rate \(lambda\)?
1️⃣ 50,000 failures per hour
2️⃣ 5 x 10^-4 failures per hour
3️⃣ 2 x 10^-5 failures per hour
4️⃣ 2 x 10^5 failures per hour
👀 Think about it before you scroll for the answer...
✅ Correct answer: 3) 2 x 10^-5 failures per hour
Correct: lambda = 1/MTBF = 1/50,000 = 0.00002 = 2 x 10^-5 failures per hour.
💡 Exam tip: If an option sounds like textbook trivia rather than something you'd apply on the job, it's usually a distractor.
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August 27, 2026 25
