Study Guide The probability of an event is a ratio that tells how likely it is that the event will take place. Example 1: Mr. Babcock picks 5 of his 25 students in his algebra class at random for a special project. What is the probabilty of being picked? The probability of any event has a value from 0 to 1. If the probability of an event is 0, it is impossible for the event to occur. An event that is certain to occur has a probabilty of 1. This can be expressed as 0 ≤ P(event) ≤ 1. Example 2: Find the odds that a member of Mr. Babcock's class will be picked for the special project. Solve each problem. 1. There are 2 colas, 1 ginger ale, 5 cherry sodas, and 4 rootbeers in the cooler. What is the probabbility of puttling out a cola? 2. It will rain 8 times in November and snow 3 times. The other days it will be sunny. What is the probabilty of a sunny day? the odds of a sunny day? The odds are 19:11 Use the following information to answer questions #3-6. 3. If one coin is chosen, what is the probabilty that a quarter will be chosen? 4. What would be the odds of choosing a quarter if all of the dimes were removed first? The odds are 2:9 5. What are the odds that a dime will not be chosen? The odds are 11:3 6. What are the odds of choosing a penny? The odds are 5:9
Probability and Odds
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The oddds of an event occurring is the ratio of the number of ways an event can occur (successes) ti the number of ways the event cannot occur (failures).
At a carnival, there is a bowl of money. It contains 50 quarters, 75 dimes, 100 nickels, and 125 pennies.