# Probability “The probable is what usually happens.”    Aristotle

The probability of an event is a measure of the likelihood that the event will occur.
The probability of any event can range from 0 to 1.

Probability of an event Predict & Display Data

Probability – Sample Space

Probability Help, ### PR17      Probability of picking a tile from a bag.

Finding the Probability of Independent Events

(Sample space UNCHANGED)

If A and B are independent events, then

P(A and B) = P(A)•P(B) Dependent Events Help,

Tree Diagram Help

ProbabilityVoc

Finding the Probability of Dependent Events

(Sample space DECREASES)

If A and B are dependent events, then

P(A and B) = P(A) • P(B given A) ### PR25      2Bills

Probability – Counting Principle Probability – Independent Event Probability Application

Theoretical probability

Theoretical Probability is determined through reasoning (the ratio of the number of favorable outcomes to the number of possible outcomes). Experimental probability

Experimental probability is found by repeating an experiment and observing the outcomes. A monkey is sitting by and hitting 4 keys randomly. Suppose that the monkey is answering a multiple choice MATH STAAR TEST. There are 56 questions and each question has 4 options. Find the experimental probability

### PR24      3Coins

Probability Writing

Probability rules