This document provides lesson content on probability of simple events. It defines key probability terms like probability, simple event, outcome, random, and complementary events. It explains how to calculate probability as a fraction, decimal, or percentage by taking the number of favorable outcomes over the total number of possible outcomes. Examples are given for calculating probabilities of coin flips, number cube rolls, and dice rolls. The lesson also includes an example of identifying the complement of an event based on survey data. Students complete guided practice, independent practice, and problem solving exercises on these probability concepts.

1. Unit 5A
Probability
Probability of Simple Events

2. Lesson 1: Probability of Simple Events
Objective: Swbat find the probability of an
event.
Do Now:

3. Lesson 1: Probability of Simple Events
Definitions
Probability is the chance that some event will
occur.
A simple event is one outcome or a collection of
outcomes.
Outcome is a possible result in a probability
experiment.
Random – each outcome is equally likely to
occur.
Complementary events are two events in which
either one or the other must happen.

4. Probability can be written as a fraction,
decimal or percent.
Value is between 0 (impossible) and
1 (certain).
Lesson 1: Probability of Simple Events

5. Lesson 1: Probability of Simple Events
The probability of an event is a ratio that
compares the number of favorable outcomes
to the number of possible outcomes.
P(event) = number of favorable outcomes
number of possible outcomes

6. Lesson 1: Probability of Simple Events
Example: Flip of a Coin
2 outcomes (Heads or Tails)
P(Heads) = ½ or .5 or 50%
P(Tails) = ½ or .5 or 50%

7. Lesson 1: Probability of Simple Events
Example: Roll of a Number Cube
6 outcomes (1,2,3,4,5,6)
P(0) = 0/6 0%
P(1) = 1/6 or .17 or 17%
P(2,3,or 4) = 3/6 or .5 or 50%
P(1,2,3,4,5,6) = 6/6 or 100%
Complement P(not a 6) = 5/6 or 83%

8. Lesson 1: Probability of Simple Events
Example: Roll of a set of dice
1 2 3 4 5 6
1
2
3
4
5
6

9. Lesson 1: Probability of Simple Events
Real-World Problem
Mr. Harada surveyed his class and discovered
that 30% of his students have blue eyes.
Identify the complement of this event.

10. Classwork
Guided Practice #1 – 5
Independent Practice #1 – 5
Problem Solving Practice #1 - 8

11. Closure
Question: What do the possibilities of an event
range between?
Exit Ticket
Homework: Practice # 1 - 18

12. Exit Ticket
There are 3 red marbles, 2 yellow marbles and
3 purple marbles in a bag.
What is the probability of picking a purple
marble?
What is the probability of the complement?

13. Homework