2.  The
probability of an event is how
likely it is to occur.
 Always a number between 0 and 1.
 Probability of 1:
 event will definitely occur.
 Probability
of 0:
 event will never occur.

3.  The
theoretical probability that an
event A will occur is:
 Can
be expressed as a fraction,
decimal, or %.

4.  Experimental
probability is found
using an experiment, survey, or
history of the event.
 Found using:

5.  Sam
rolled a die 50 times.
A 3 appeared 10 times.
 What is the experimental probability
of rolling a 3?
 What
is the theoretical probability?

6.  A coin
is tossed 60 times. Heads
appeared 27 times.
 Find the experimental probability of
flipping heads.
 What
is the theoretical probability?

7.  In
1998, a survey asked internet
users for their ages. Find the exp.
probability that a randomly selected
internet user is:
# of
Age
users
 at most 20 years old?
Under 21
21 -40
 at
least 41 years old?
1636
6617
41 – 60
3693
61 – 80
491
Over 80
6

8.  Using
the table, what was the
experimental probability of an even
number being rolled?
 What
is the
theoretical
probability?