A system has three components in parallel with reliabilities 0.9, 0.7, and 0.5. System reliability is
A) 0.315
B) 0.700
C) 0.900
D) 0.985
E) 2.100

Question

Quizplus · Accepted Answer

The reliability of the system in parallel is calculated as 
Rsystem = 1 - (1-R1)*(1-R2)*(1-R3), where R1, R2, R3 are the reliabilities of the individual components. 
Plugging in the values, we get 
Rsystem = 1 - (1-0.9)*(1-0.7)*(1-0.5) = 0.985.
Therefore, the best choice is D.

A System Has Three Components in Parallel with Reliabilities 0