Unit 2
A C T I V I T Y 10
AC TIVIT Y
25 MIN
Probability
Use after
Unit 2, Session 3.5
Vocabulary/Vocabulario
“I have 1 chance out of 6, because there are 6 possible outcomes,
and only one of them is a 3.”
We say that “1 out of 6” is the probability of rolling a 3. Probability is the chance
that something will happen. What is the probability of rolling a 5? What is the
probability of rolling an even number?
Materials/Materiales
• number cubes/
cubos numéricos
• Activity 10 Master (see below)/
Actividad 10 (ver abajo)
Un i t 2
Activity 10
MASTER
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Surveys and Line Plots
NOTE Students find the probability of
an event. They also determine whether or
not a spinner is fair.
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Give each pair of students a number cube. How many different ways can the number
cube land? Each way is called a possible outcome. What are the possible outcomes
when you roll a number cube once? How many of those possible outcomes are
the number 3? Suppose you roll a number cube once. Describe your chances for
rolling a 3.
Students might say:
possible outcome/
resultado posible
probability/
probabilidad
experiment/
experimento
actual outcome/
resultado real
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PAIR
Have each pair of students make the table shown
at the right. Today we are going to do an
experiment with a number cube. You will
roll a number cube 18 times. In the
actual outcomes column, use tally marks to
show what number comes up on each roll.
Possible
Outcomes
Actual
Outcomes
1
2
3
4
5
6
After students complete the experiment, ask,
Do you think each pair of students in the class obtained the same results? Explain.
Students might say:
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Have students discuss which numbers came up most, which numbers came up least,
and how often each number came up. Explain that probability tells you what is likely to
happen. It does not necessarily tell you what will exactly happen. Have students predict
what results they might expect to obtain if the experiment were repeated.
© Pearson Education, Inc. 3
PR AC TICE
In the Activity 10 Master, students determine probabilities for a variety of
situations.
DIFFERENTIATION : Suppor ting the Range of Learner s
Have students work in pairs to play a game with a number cube. The
number cube is rolled 19 times. One student wins the round if the number rolled is odd;
the other student wins if the number rolled is even. Have them make a bar graph to
record each of the six possible outcomes as they occur. The student who wins more
rounds wins the game. Explain that when each player has an equally likely chance to
win, the game is called a fair game. Otherwise the game is unfair. You may want
students to design a game with a number cube or spinner that is unfair.
Unit 2: Surveys and Line Plots
Session 3.5 (End-of-Unit Assessment)