7.5 Different Ways to Express Probability

Focus: express probabilities as ratios, fractions and percent As a mathematical formula, we can express probability: P(event) = # of Favourable Outcomes # of Possible Outcomes So, the Probability of an event can be calculated as the # of favorable outcomes, divided by the total # of all possible outcomes. Explore - p. 279: Complete the chart using the information in the textbook and the examples given: Probability can be expressed as a: - ratio - fraction - percent

A certain event is one that will always happen and is expressed as 1 or 100% - rolling a number on a regular six-sided die is a certain event An impossible event is one that will never occur and is expressed as 0 or 0% - rolling the number 7 on a regular six-sided die is an impossible event All probability is between 0.0 and 1.0 (the decimal form of the calculated percentage) or 0% and 100% *Complete the Example on p. 281 *Practice - Page 282-283 - #1-7