4.2 – Probability Basics
Name: __________________________
Objective: Define basic probability terms. Identify probabilities of basic situations.
A contestant on a game show gets to take one spin and try
his luck. Find the following probabilities.
1.
2.
3.
4.
5.
6.
1.
P(bankrupt)
P(making 50 dollars)
P(not making anything)
P(making more than 50 dollars)
P(making 150 or 500 dollars)
P(making 150 and 500 dollars)
2.
3.
4.
5.
6.
Task 1: Place your group’s deck of cards face up on your group of desks.
-
The 52 cards on your desk represent the sample space.
Sample Space:
Example: List the sample space for flipping a coin 4 times. (16 possibilities)
Task 2: Take your row of spades and group them separate from the rest of your deck.
-
The row of spades represent the probability the event that a spade is selected. P(spade) =
Event:
Note: An event can have multiple outcomes. Be sure to consider every possible outcome for an event.
The set of all possible outcomes of a trial must have a probability of 1.
- Suppose the probability of getting to class on time is 0.8. What is the probability of NOT getting to
class on time?
- We call this the complement
Complement:
Take that same event of choosing a spade and now we look at the complement.