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Appendix 8

## Chapter 2

 (a) (b) 1. 114 1.1 2. 0.99 0.42 (0.12* ) 3. 10–5 10–3 4. 2.2 × 10–3 0.18 (0.22* ) 5. Negligible Negligible 6. Unavailability × 2 Unavailability × approx 2

* Beware the approximation. λt is large (i.e. 0.876). Furthermore, if the 10 000 hr per year approximation were used, then λt = 1.

## Chapter 5

1. Accumulated time T = 50 × 100 = 5000 hr. Since the test was time truncated n = 2(k + 1).
Therefore,
(a) n = 6, T = 5000, α = 0.4. From Appendix 2, χ2 = 6.21

$Math Equation$

(b) n = 2, T = 5000, α = 0.4. From Appendix 2, χ2 = 1.83

$Math Equation$

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