Odds

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Odds
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A bag contains 5 green marbles, 3 yellow marbles,
and 3 blue marbles. What is the probability of
drawing a green marble from the bag? There are 5
green marbles so the probability is 5 out of 11
marbles or 6 out of 11 marbles wont be
green. Another way to describe the chance of an
events occurring is with odds.
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The odds in favor of an event is the ratio that
compares the number of ways the event can occur
to the ways that the event cannot occur.
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Definition of Odds The odds in favor of an
outcome is the ratio of the number of ways the
outcome can occur to the number of ways the
outcome cannot occur. Odds in favor

number of successes number of
failures. The odds against an outcome is the
ratio of the number of ways the outcome cannot
occur to the number of ways the outcome can
occur. Odds against
number of
failures number of successes
5

• Find the odds of each outcome if a die is rolled
• A number greater than 5
• 15
• 2. A number less than 4
• 33
• 3. A multiple of 2
• 33
• Not a three
• 51

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• Find the odds of each outcome if the spinner at
  the right is spun.
• Blue
• 13
• Green
• 13
• 3. Not green
• 31
• 4. Red or orange
• 22

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Find the odds of each outcome if a pair of pair
dice are rolled. 1. An even sum 1818 2. An
odd sum 1818 3. A sum that is a multiple of
3 1224 4. A sum less than 2 036
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5. A composite number 1818 6. A prime number
greater than 9 234 7. Not a sum of 7 306 8.
Not a sum of 11 or 12 333
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A bag contains 3 red marbles 2 black marbles 4
green marbles and 1 blue marble Blue
marble 19 Red or black 55 Black, green or
blue 73 Brown marble 010 Neither blue nor
red 64 32
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A cookie jar is filled with the following
cookies, 4 chocolate chip 10 oatmeal raisin, 2
peanut butter and 8 snickerdoodle. What are the
odds of getting a snickerdoodle? 816 Of getting
a peanut butter 222 111
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Homework page 522 9-28