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082-Engineering-Mathematics-Anthony-Croft-Robert-Davison-Martin-Hargreaves-James-Flint-Edisi-5-2017

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932 Chapter 28 Probability

Solutions

1 (a) 0.2 (b) 0.5 (c) 0.455

(d) 0.071 (e) 0.1690 (f) 0.7998

(g) 0.8630 (h) 0.1319

2 (a) 0.75 (b) 0.16 (c) 0.21

(d) 0.0775 (e) 0.619 (f) 0.734

3 (a) 0.909 (b) 0.4615 (c) 0.42

4 (a) Thecomponent isnot reliable.

(b) Thecomponent isnot made bymachine A.

(c) Thecomponent isreliable and made by

machine A.

(d) Thecomponent isreliable oritis made by

machine A.

(e) Thecomponent ismade by machine A anditis

notreliable.

5 (a) 0.6228 (b) 0.1476 (c) 0.1624

6 (a) Thecircuit isnot made bymachine A.

(b) Thecircuit willlast forlessthan 600 hours.

(c) Thecircuit isfunctioning oritis made by

machine A.

(d) Thecircuit isfunctioning and willlast foratleast

600 hours.

(e) Thecircuit ismade by machine Aand willlast

foratleast600 hours.

7 (a) 2.1203 (b) 2.2469 (c) 0.0323

8 (a) 3.43 ×10 −4 (b) 0.0137 (c) 0.9997

(d) 0.1816

9 0.9948

10 (a) 0.8154 (b) 1.024 ×10 −7

(c) 0.9999999

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