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Moderate

System Failure

APSTAT-K4CLJY

A toolmaker fabricates an item that has a system of $4$ O-rings.

Each O-ring has a probability of $0.95$ of properly functioning. Assume that each O-ring operates independently of the others, and the entire system fails if one or more of the O-rings fail.

What is the probability that the system functions properly?

A

$0.95$

B

$0.815$

C

$0.75$

D

$0.05$

E

$0.185$