1. Useful resources for Calculus: http://www.cse.cuhk.edu.hk/~csc2800/resource/index.html http://www.sosmath.com/calculus/calculus.html http://en.wikipedia.org/wiki/Calculus

2. Slides to skip 36-54; 64-65; 70-72; 78-79; 93-99; 103-104; 124-195.

3. Slide 9 Weibull Distribution: Failure rate constant over time: k=1 (becomes exponential distribution) Failure rate decreases over time: k<1 Failure rate increases over time: k>1 From Wikipedia

4. Slide 20 Forget about the second bullet. It is not a rigorous argument. If you look at a trace, the derivative of of N f (t) = dN f (t)/dt is either zero or infinite (a dirac delta function). In other words, the definition of R(t) is OK, but not that of R’(t).

5. Slide 22

6. Slide 29 Wording is confusing. “15% components last 90 hrs but fail before 100 hrs” can be interpreted as P(90<X<100) = 0.15. To be more precise, should have said “Among components that last more than 90 hrs, 15% of them last less than 100 hours”. Then the corresponding probability would be a conditional probability.