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# Simple probability question! watch

1. what
2. Have you done a tree diagram?
P(X=2) = Prob(BB), P(X=3) = Prob(BW or WB), P(X=4) = Prob(WW).
Then use the formula for E(X).
3. yea i HAVE done it but i need to find EX via indicator variables
4. (Original post by vc94)
Have you done a tree diagram?
P(X=2) = Prob(BB), P(X=3) = Prob(BW or WB), P(X=4) = Prob(WW).
Then use the formula for E(X).

yea i HAVE done it but i need to find EX via indicator variables

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Updated: March 19, 2011
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