Applications of Probability

1. OPEN ENDED Describe two real-life events that are dependent.
2. OPEN ENDED Describe two mutually exclusive events and two inclusive events.
3. Writing in Math Use the information on page 730 to explain how probability applies to what teens do online. Include an explanation of whether the events listed in the graphic are mutually exclusive or inclusive.

Adding Probabilities
GET READY for the Lesson
What Teens do Online
100
89
80
76
75
The graph shows the
results of a survey
about what teens do
online. Determining
the probability that a
randomly selected
teen sends/reads
e-mail or buys things
online requires
adding probabilities.
57
60
43
Teens
40
20
News/current
Events
Instant
Messages
Research
College
Buy Things
E-mail
Sony
Source: pewinternet.org
Activity
Mutually Exclusive Events When you roll a die, an event such as rolling
a 1 is called a simple event because it cannot be broken down into smaller
events. An event that consists of two or more simple events is called a
compound event. For example, the event of rolling an odd number or a
number greater than 5 is a compound event because it consists of the
simple events rolling a 1, rolling a 3, rolling a 5, or rolling a 6.
When there are two events, it is important to understand how they are
related before finding the probability of one or the other event occurring.
Suppose you draw a card from a standard deck of cards. What is the
probability of drawing a 2 or an ace? Since a card cannot be both a 2 and
an ace, these are called mutually exclusive events. That is, the two
events cannot occur at the same time. The probability of drawing a 2 or
an ace is found by adding their individual probabilities.
P(2 or ace) = P(?) + Place)
Add probabilition