Teaching Algebra with Manipulatives

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Algebra Activity
(Use with Algebra 1, Lesson 14-5)
Theoretical and Experimental Probability
Materials:
paper bag, 20 two-inch pieces of paper
Collect the Data
Step 1 Mark 4 slips of paper with an X, 7 slips of paper with a Y, and
9 slips of paper with a Z.
Step 2
Step 3
Put the slips of paper into the bag and mix well.
Draw one slip of paper from the bag and record its letter. Use
the space below to record your results.
Step 4 Return the slip of paper to the bag and mix well. Repeat Steps 3
and 4 until you have completed 20 trials.
Analyze the Data
1. Calculate the experimental probability of choosing each letter.
Express each probability as a percent.
2. Calculate the theoretical probability of choosing each letter.
Make a Conjecture
3. Compare the experimental probability with the theoretical probability.
How similar are they?
4. Predict what will happen to the experimental probability as you
increase the number of trials.
© Glencoe/McGraw-Hill 208 Teaching Algebra with Manipulatives