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Is What Should Happen
What Will Happen?
What is theoretical probability?
How many faces does a number cube have?__________
What is the probability that a:
1 will be rolled?__________ 4 will be rolled?__________
2 will be rolled?__________ 5 will be rolled?__________
3 will be rolled?__________ 6 will be rolled?__________
What is experimental probability?
Use the graphing calculator to conduct an experiment. Follow the directions below.
Step 1:
Press the APPS key then press 0
which is Prob Sim. Press any key to
open Probability Simulation.
Step 2:
Press ZOOM which will access the
option menu on the bottom of the
screen. Type the last four digits of
your phone number and then press
the GRAPH key.
Step 3:
Press 2 which is Roll Dice. Press ZOOM to change the settings. Change the trial set to 60 and press GRAPH.
Step 4:
Now, it is time to start the experiment. Now press WINDOW and the calculator will roll the number cube 60 times.
Use the right arrow to see how many times the 1 was rolled.
What fraction of the 60 rolls were a:
1?__________ 3?__________ 5?__________
2?__________ 4?__________ 6?__________
This is the experimental probability.
Is the experimental probability close to the theoretical probability?
When you look at the bar graph on the calculator, what should the bars look
like when the experimental probability is the same as the theoretical
probability?
Step 5:
Continue pressing the WINDOW key to roll the number cube until all the bars on the bar graph are the same height.
How many rolls did it take in order for the theoretical probability and
experimental probability to be the same?
Compare your response to the question above with other students. What do
you notice?
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