*Obejectives:*

* Develop and apply the basic formula for geometric probability

**The probability of an event:**

Definition: Probability is a number between 0 and 1 that indicates the likelyhood that an event will occur. A probability of 0 indicates that an event will not occur. A probability of 1 indicates tht an event must occur.

There are two types of probability, theorectical and experimental.

**Theoretical Probability:**

Theoretical probability can be determined with mathematical precision. It is a fraction whose denominator is the total of all outcomes and the numerator is the outcomes in which the event occurs.

**Experimental Probability:**

Experimental probability can be determined during an experiment.

Students can explore different experiments to better understand the difference between theoretical and experimental probability. The following website is a good interactive site for distinguishing between the two types of probability.

Click here.

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