Probability question

  • Thread starter kasse
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  • #1
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The numbers represent the probability that each component works.

a) What's the probability that the entire system works?
b) Given that the system works, what's the probability that the component A is not working?


a) P=.75112, easy
b) Don't know what to do here....
 

Answers and Replies

  • #2
statdad
Homework Helper
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Since there is no component A in the diagram, I'd say you can't answer the second question.
If you were asking this: Given the system works, what is the probability [tex] 1 [/tex]
is not working, think this way:

If the system is operating, you know that
* [tex]3, 4 [/tex] and [tex] 5 [/tex] are all operating
and
* [tex] 1 [/tex] is not operating, status of [tex] 2 [/tex] is unimportant

what can you do with this?
 

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