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Unformatted text preview: P1 head on 2 tosses = ( ) P HT or TH = + PHT PTH = + = 14 14 24 Rule = + PA or B PA PB Example: toss a fair coin once; pick one ball from a bag containing 8 white and 2 red balls. P(H or W)? Possible solution: = + PH or W PH PW = + 12 810 = . ( ) 1 3 not possible Correct Solution: W H R W T R = = ∴PH or W 1 220 1820 = +PH PW PH and W = +12 810 820 = 1820 Summary 1. P(A or B) = + ( ) PA P B if A, B are mutually exclusive 2. P(A or B)= P(A) + P(B) – P(A and B) Venn: 3. Independent: P(A and B) = × PA PB 4. Dependent: P(A and B) = ( )× ( ) P A P BA...
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 Winter '09
 Brian
 Coin flipping, fair coin, Bernoulli trial, Coin toss example

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