Name _______________________________________ Period _____ Date _______________
Course 2: 13.1-13.3 Check for Understanding
outcomes
favorable
theoretical
tree diagrams
the counting principle
total
experimental
Use the word bank to fill in the blanks for #1-4.
1.
To find the probability of an event, write the ______________________ outcomes over the
__________________________ possible outcomes.
2.
__________________________ probability is based on knowing all of the equally likely outcomes.
3.
___________________________ or _____________________________ can help you
determine the total number of possible outcomes.
4.
Possible results are called ___________________________.
5.
What are the three ways you can write a probability?
__________________________________________________________________________
__________________________________________________________________________
You have a bag of marbles. There are 8 blue, 6 green, and 12 yellow marbles. Use this information to
find the probabilities for #6-8. Simplify if possible.
6.
P(green)
9.
You roll a number cube.
7.
P(blue or yellow)
8.
P(not yellow)
a) What is the probability you roll an even number? Write your answer as a percent.
b) Predict how many times you will roll an even number in 300 rolls.
10.
There are a total of 50 gumballs in a bag. 20% of the gumballs are red, 40% of the gumballs are
orange, 30% of the gumballs are yellow, and 10% of the gumballs are white.
a) How many gumballs are red? Orange? Yellow? White?
b) What is the probability of choosing a red OR white gumball?
Use the following information to draw a tree diagram.
11.
You are having a cookout. Your guests can choose from hamburgers or hotdogs. They can also
choose pasta salad or fruit. For a beverage, they can choose from Pepsi, Sprite or water. Finally,
they get to choose a cookie or brownie for dessert.
12.
How many different options do your guests have? ____________________
13.
What is the probability a guest will choose an option that includes both a hot dog and a Pepsi?
Use the counting principle to answer the following questions
14.
In student council 3 students are running for president, 4 students running for vice-president, 2
students running for secretary, and 2 students running for treasurer. How many different ways can
the student council officers be chosen?
15.
If on a license plate there are 3 digits followed by 3 letters. How many different license plates
are possible?
16.
You roll a number cube then flip a coin twice. What is the probability of getting a multiple of 3
and two heads? (think
17.
=
)
You have to pick a 4 digit PIN. What is the probability that you choose a PIN with all four of the
same even number?