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Experimental Probability

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Experimental Probability the likelihood of an event is estimated by repeating an experiment many times and observing the number of times the event happens

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**Number of times the event occurs**

PROBABILITY = Number of times the event occurs total number of trials

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**You must conduct an experiment in order to determine the experimental probability!**

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Let’s do an experiment in order to find the experimental probability of rolling certain numbers on a die!

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Draw this table. My results Roll Tally Marks Frequency 1 2 3 4 5 6

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Directions: 1. Roll the die on your desk. 2. Mark your result on the table. 3. Do this 20 times!!

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**When you have reached 20……STOP!**

Put your die down on your desk and do not play with it!

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**Questions: You must write the following questions and then answer them.**

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**What were the possible outcomes when rolling a die?**

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**2. Compare your table with a neighbor. Did they get the same results**

2. Compare your table with a neighbor. Did they get the same results? Why or why not?

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**3. Using your data, what is the P(1)?**

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4. What is P(2)?

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5. What is P(3)?

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6. What is P(4)?

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7. What is P(5)?

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8. What is P(6)?

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9. What is P(7)?

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**10. Now, add up your answers for questions 3 – 8. What do you notice?**

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1 Copyright © 2014, 2012, 2009 Pearson Education, Inc. Chapter 9 Understanding Randomness.

1 Copyright © 2014, 2012, 2009 Pearson Education, Inc. Chapter 9 Understanding Randomness.

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