Probability
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Probability. 6.4. Outcomes. Possible results of an action Examples: 6 outcomes for rolling a dice (1,2,3,4,56) 2 outcomes for flipping a coin (heads or tails). Event. The outcome or group of outcomes. Probability of an Event. Find the probability of rolling one number cube .

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Outcomes
Outcomes

  • Possible results of an action

  • Examples:

    • 6 outcomes for rolling a dice (1,2,3,4,56)

    • 2 outcomes for flipping a coin (heads or tails)


Event
Event

  • The outcome or group of outcomes






Complement
Complement

  • The opposite of that event

    Example:

    Rain and No Rain are complements

  • Probability of Event + Complement=1




Finding odds
Finding Odds

ODDs in Favor of an Event

ODDs Against an Event


ODDS

What are the odds that a quarter chosen at random from the five shows a horse?

1 to 4

What are the odds that it shows no horse?

4 to 1


ODDS

Consider the event of randomly choosing a quarter that shows the outline of a state.

What are the odds in favor of this event?

2 to 3

What are the odds against the event?

3 to 2


Homework
Homework

  • Page 298 (2-30 even and 31)


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