Probability:

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Probability
It's All About Chance!

• Created By Shawn Poore
• Beech Springs Intermediate School
• http//www.spart5.k12.sc.us
• Graphics Courtesy of www.animfactory.com
• Math Standards (Probability and Statistics IVB1)

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What Is Probability?

• Probability is the chance that an event will
  occur.
• For example, what is the probability that you
  will roll a 4 (using one standard 6-sided die)?
• One out of six
• This can be written as a fraction 1/6
• It may also be written as 16.

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A Short Way to Write Probability

• Probability of rolling a six
• Probability of getting tails
• Probability of choosing a red marble

• P (6)
• P (tails)
• P (red)

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The Boundaries of Probability

• If an event has a probability of zero, this event
  will not occur.
• If an event has a probability of 1, there is 100
  chance that it will occur.
• Probability is usually between 0 and 1

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Probability When Is It Used?

• The concept of probability can be used in many
  ways
• Dice
• Coins
• Cards
• Marbles
• Seating Arrangements
• Games (like Yahtzee)

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Probability and Dice
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Probability and Dice Questions

• P (sum of 12)
• P (sum of 1)
• P (rolling a 1 first)
• P (sum of 7)
• Why is 7 considered a lucky number?

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Lucky Sevens
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Probability and Coins

• When a quarter is flipped
• P (heads)
• P (tails)
• P (heads and tails)
• P (heads or tails)

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Its Time for a Quiz

• What is probability?
• What does a probability of zero mean?
• What does a probability of 1 mean?
• Where is probability used in the real world?

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Key

• The chance that an event will occur
• P (0) means that the event will not occur.
• P (1) means that the event will certainly occur.
• Used in games, with coins, predicting weather,
  and other situations