Math 3 G Block
December 09, 2014
Objective: Calculate the probability of random
events
Example: Suppose you roll two different-colored
number cubes. Find the probability of each event:
a) At least one number cube shows a 5
b) The sum of the numbers is exactly 5.
Math 3 G Block
December 09, 2014
One way to answer this question would be to list all possible outcomes (referred to as the sample space).
a) At least one number cube show a 5
Math 3 G Block
December 09, 2014
b) The sum of the numbers is exactly 5.
Math 3 G Block
December 09, 2014
Math 3 G Block
December 09, 2014
Let's flip 4 coins now.
We need an easier way to count. First let's find the total
number of possible outcomes (i.e., the sample space).
Math 3 G Block
December 09, 2014
Now how many different ways can you get exactly 2
heads on 4 flips? (This is a subset of the sample
space)
Now calculate the probability of getting 2 heads in
Game 4 and answer the question.
Math 3 G Block
December 09, 2014
Vocabulary:
Mutually Exclusive Events:
Math 3 G Block
December 09, 2014
Vocabulary:
Independent Events:
Homework:
p.182 #1,8,9,10,14
Math 3 G Block
December 09, 2014