# Cons30 S Probability Odds

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Information about Cons30 S Probability Odds

Published on April 7, 2009

Author: nmal

Source: slideshare.net

PROBABILITY AND ODDS

RECALL: A RATIO is a comparison of two numbers, similar to a fraction... 0.25 1:4 1/4 5:10 .... reduces to... 1:2

ODDS IN FAVOUR: The RATIO of favorable outcomes to non­favorable outcomes. FAVORABLE OUTCOMES :  NON­FAVORABLE OUTCOMES results you don't want results you want EX  Roll a die.  What are the odds in favour of rolling a 6?

ODDS AGAINTS: The RATIO of non­favorable outcomes to favorable outcomes. NON­FAVORABLE OUTCOMES :  FAVORABLE OUTCOMES results you want results you don't want EX  Roll a die.  What are the odds against rolling a 3?

EX  Tossing a coin... What are the odds against tossing heads? What are the odds in favour of tossing tails?

From a deck of cards, what are the .... odds in favour of drawing a club? odds against drawing a King? odds in favour of drawing a red card? odds against drawing a black 7?

EX  A wallet contains five \$10 bills, two \$5 bills and three \$20 bills.    What are the odds against picking out \$20 bill? # of bills that are NOT \$20 : # of bills that are \$20 # of bills = 5 + 2 + 3 = 10 bills total 3 of them are \$20 and 7 of them are NOT \$20

HOMEWORK p.337; #1­11

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