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Unformatted text preview: B: {HHH,TTH,THT,HTT} o B can have 1 or 3 so P(B) = 4/8 P(A^c) = 1 (7/8) = 1/8 P(B^c) = 1 (4/8) = 3.4 Additive Rule and Mutually Exclusive Events o AdditiveRule: Fig 3.41 Why is it necessary to subtract out (fig 3.42)? Ex #1 Drug Testing Find (fig 3.43) Need: P(A), P(B), and (fig 3.42) Table for drug test (fig 3.44) Mutually Exclusive o If (Fig 3.45) = , then A and B are said to be Mutually exclusive and (fig 3.42) = 0 o Ex. Toss a fair die once. Define: event A = (numver greater than 5) Define EDvent B = (odd number) Are A and B mutually exclusive? **Important Note: if A and B are Mutually Exclusive, then (fig 3.43) = P(A) + P(B) STA Class 04:02:10 A = {6} B = {1, 3, 5} Fig 3.46...
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 Fall '07
 Bagwhandee

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