Topic:
Main Ideas/Questions
Theoretical
PROBABILITY
EXAMPLES
Notes/Examples
• Probability is a measure of the
will occur.
• When all outcomes are equally likely, the theoretical probability of
event E is the ratio of the number of favorable outcomes to the
total number of outcomes.
14
Probabilities have values between
expressed as a fraction, decimal, or percent.
a) P(multiple of 3)
1. The spinner below is spun once.
Find each probability as a
fraction (in simplest form), a
decimal, and a percent.
13
11
15
10
16 1
P(E)=
9 8
2
3
4
Class:
# of favorable outcomes
total # of outcomes
5
and
b) P(prime number)
that a specific
4. Finn guessed on the last 3 true-
or-false questions on his math
quiz. What is the probability he
got exactly two questions correct?
and can be
c) P(even or greater than 5)
d) P(odd and at most 9)
Give the answer to the following questions as fractions in simplest form.
2. A pencil box contains 5 red, 12
3. What is the probability of drawing
an ace or a diamond from a
standard deck of playing cards?
blue, 10 green, and 3 yellow
markers. If a marker is chosen at
random, what is the probability
that it is not yellow?
5. Two standard dice are rolled.
What is the probability that the sum
of the two dots on the dice is at
most 5?
Gina Wilson (All Things Algebra", LLC), 2020