- There are 2 possible outcomes
- There are 2 outcomes which have probabilities P and P-1
- P + Q=1 --> there are no other possible outcomes
- probability in any trial is independent of probability in previous trial
- variable (X) is random
1. Always define X
2. X~(n,p)
3. P(X=r) = nCr x Pr x (1- P) n-r
B~(n,p) the expectation for the number of success' is np
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