7th Grade Math

Multi-Part

Lesson (^1) Probability
PART A B CD
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Multi-Part
Lesson 1
Get ConnectED
GLE 0706.5.5
Understand and apply basic
concepts of probability.
Lesson 1B Probability 435
Main Idea
Find sample spaces
and probabilities.
Vocabulary
sample space
tree diagram
odds in favor
Sample Spaces
Here is a probability game for two players.

• Place two green marbles into
  Bag A. Place one green and
  one red marble into Bag B.


• Without looking, Player 1
  chooses a marble from each
  bag. If both marbles are the
  same color, Player 1 wins a
  point. If the marbles are
  different colors, Player 2 wins
  a point. Record your results and
  place the marbles back in the bag.


• Player 2 then pulls a marble from each bag and records the results.
  Continue alternating turns until each player has pulled from the
  bag 10 times. The player with the most points wins.

Now, play the game. Who won? What was the final score?

The set of all of the possible outcomes in a probability experiment is

called the sample space. A tree diagram is a display that represents

the sample space.

Find a Sample Space

ICE CREAM A vendor sells vanilla and chocolate ice cream.

Customers can choose from a waffle or sugar cone. Find the

sample space for all possible orders of one scoop of ice cream

in a cone.

Make a tree diagram that shows all of the possible outcomes.

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