An electrical appliance will not work unless component QK does. Component QK's reliability is 0.95. Every other part of the appliance is 100 percent reliable. What would the reliability of the appliance be if a backup QK were added?
A)0.95
B)0.9975
C)0.9025
D)0.9205
E)0.9795

Question

Quizplus · Accepted Answer

The reliability of the appliance with a backup QK can be calculated by considering the probability that both QK components fail, which is 0.05 * 0.05 = 0.0025. Therefore, the reliability with a backup is 1 - 0.0025 = 0.9975.

An Electrical Appliance Will Not Work Unless Component QK Does