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kingwinner
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Homework Statement
Consider a system of water flowing through valves from A to B as shown in the diagram. Valves 1, 2, and 3 operate independently, and each correctly opens on signal with probability 0.8. Find the probability distribution / probability mass function for Y, the number of open paths from A to B after the signal is given (Note that Y can take on the values 0, 1, and 2.)
http://www.geocities.com/asdfasdf23135/sta1.JPG
Homework Equations
Probability mass function just means finding the probabilities of all possible outcomes
The Attempt at a Solution
I don't understand the question itself so I can't get anywhere (coloured in red). Does anyone actually understand what is going on in this scenario? I would truly appreciate if somebody can explain it to me.