Introduction to probability

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# Introduction to probability - PowerPoint PPT Presentation

Introduction to probability. What is probability? The likelihood of an event Occurring.

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Presentation Transcript

Introduction to

probability

What is probability?

The likelihood of an event Occurring

Suppose you have 4 nickels, 2 dimes, and 6 quarters in your pocket. If you draw a coin randomly from your pocket, what is the probability that: a. You will draw a nickel? b. You will draw a half-dollar? c. You will draw a quarter?

d. You will draw a silver coin?

Event – “drawing a specific coin”

• Sample space – All possible out comes
• P(E) = Number of favorable outcomes

Total Number of Outcomes

Ways to express probability

• Fraction
• Decimal
• Percent
• Odds
• Theoretical Probability

You will draw a nickel?

• P(nickel) =
• b. You will draw a half-dollar?
• P(half-dollar) =
• c. You will draw a quarter?
• P(quarter) =
• You will draw a silver coin?
• P(silver coin) =
• What is the probability of drawing each
• “different” item in the bag?
• Rules:
• NO ONE LOOKS INSIDE!!!
• ONLY 1 item can be drawn out at a time.
• The Item MUST be put back in the bag before another Item is drawn.
• Create a system for recording your results.

NOW……

• If I told you there are 40 chips in your bag….
• Predict how many of each are in your bag
• Red Chips
• Blue Chips
• Green chips
• Purple chips
• NOW COUNT!!!

Let the Good Times Roll!!

Pick a Partner.

Select which player will be ODD and which will be EVEN.

Each turn consists of rolling 2 dice.

One player rolls to find the product of the two dice.

If the product is the even, then the player who predicted even gets a point. If the product is the odd, then the player who predicted odd gets a point.

First player to 10 points WINS!!