11-2: ProbabilityWarm-Up: Move your desks into groups.

1. Describe a situation in which the number of outcomes is given by 8C3.

2. How can we change the situation so it becomes 8P3?

Experimental Probability

1) A softball player got a hit in 20 of her last 50 times at bat. What is the experimental probability that she will get a hit in her next at bat?

The probability of an event is a number between 0 and 1 (or a percent between 0% and 100%),unless the event is impossible = 0 (or 0%) OR the event is certain = 1 (or 100%).

Sample Space: the set of all possible outcomes to an experiment or activity.

Equally likely outcomes: each outcome in a sample space has the same chance of occurring.

2) – What is the sample space for rolling a standard number cube? - Is this an example of equally like outcomes?

Roll You Group Probability1 2 3 4 5 6

Theoretical Probability

Event outcomes(event)

Sample Space outcomesP

Compare the experimental probability to your theoretical probability for rolling a number cube.

Finding Geometric Probability 3) A batter’s strike zone depends on the height and stance of the batter. What is the geometric probability that a baseball thrown at random within the batter’s strike zone will be a high-inside strike (one of the hardest pitches to hit)?