Engineering Board Exam Reviewer · Mutually Exclusive and Independent Events · medium
Two machines operate independently. Machine 1 works with probability 0.9 and machine 2 with probability 0.8. Find the probability that at least one machine works.
- 0.72
- 0.85
- 0.98
- 0.9
Answer
C. 0.98
Solution
P( at least one)=1-P( neither)=1-(0.1)(0.2)=0.98.
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