Probability
Introduction
to
MATH 10
Probability
Probability is used to describe how likely
or unlikely it is that something will
happen. Probability may be given in
fraction, decimal, or percent.
Try This!
The Sexbomb Girls is planning
a concert tour in three cities –
Manila, Cebu, and Davao. In
how many ways they can
arrange their schedule?
TOUR
3
TOUR
4
TOUR
5
TOUR
1
TOUR
2
TOUR
6
Davao Davao Cebu Manila Manila Cebu
Cebu Manila Davao Cebu Davao Manila
Manila Cebu Manila Davao Cebu Davao
POSSIBLE
SCHEDULE
Motivation
Using a tree diagram, let us
determine the outcomes of an
experiment of tossing a single
coin twice.
Let us toss a single coin twice
H
Let’s say that we got a HEAD
on the first toss
H
And got another HEAD for the
second toss
H
H
So our first possible outcome
would be HEAD and HEAD or HH
H HH
H
Let’s say that we got a HEAD on
the first toss
H HH
H
but we got a TAIL on the
second toss
T
H HH
H
T HT
So our second possible outcome
would be HEAD and TAIL or HT
H HH
T HT
Let’s say that we got a TAIL on the
first toss
H
T
H HH
T HT
but we got a HEAD on the second
toss
H
T
H HH
H
T HT
So our third possible outcome
would be TAIL and HEAD or TH
H
T
H HH
H TH
T HT
Let’s say that we got a TAIL on the
first toss
H
T
H HH
H TH
T HT
And got another TAIL for the
second toss
H
T
H HH
H TH
T
T HT
So our fourth possible outcome
would be TAIL and TAIL or TT
H
T
H HH
H TH
T TT
Possible Outcomes
H
T
H
T
H
T
HH
HT
TH
TT
POSSIBLE OUTCOMES
HH - HEAD, HEAD
HT - HEAD, TAIL
TH - TAIL, HEAD
TT - TAIL, TAIL
QUESTIONS
a. As illustrated in the above diagram, what
are the outcomes of tossing a single coin
twice?
b. If a coin is tossed once, how many possible
outcomes?
c. What are the possible outcomes of tossing
a coin once?
d. What do you call the set of all possible
outcomes of an experiment?
TERMS AND DEFINITION
Sample
Space
Event
Simple
Event
Compound
TERMS AND DEFINITION
Sample
Space
the set of all possible outcomes of
an experiment.
TERMS AND DEFINITION
Sample
Space
the set of all possible outcomes of
an experiment.
Example: Sexbomb Girls concert
tour
Set of possible outcomes:
TERMS AND DEFINITION
a subset of a sample space
or simply part of the entire
Sample Space
Event
TERMS AND DEFINITION
a subset of a sample space
or simply part of the entire
Sample Space
Event: The tour starts in
Manila.
Event
TERMS AND DEFINITION
it consists of a single outcome or a
single event that cannot be further
broken down into smaller events.
Simple
Event
TERMS AND DEFINITION
it consists of a single outcome or a
single event that cannot be further
broken down into smaller events.
Simple Event: The tour schedule is
Manila–Cebu-Davao.
Simple
Event
TERMS AND DEFINITION
it consists of a single outcome or a
single event that cannot be further
broken down into smaller events.
Simple Event: The tour schedule is
Manila–Cebu-Davao.
Compound
Event
TERMS AND DEFINITION
Events which consist of more than one
outcome.
A compound event is any event
combining two or more simple events.
Compound Event: The tour ends in
Compound
Event
TERMS AND DEFINITION
Sample
Space
the set of all possible outcomes
of an experiment.
Example: Rolling a die
Set of possible outcomes: 1, 2, 3,
4, 5, 6
TERMS AND DEFINITION
Event
a subset of a sample space or
simply part of the entire Sample
Space
Event: Getting an even number in
rolling a die once
TERMS AND DEFINITION
it consists of a single outcome or a
single event that cannot be further
broken down into smaller events.
Simple Event: Getting 2 in rolling a die
once
Simple
Event
TERMS AND DEFINITION
Events which consist of more than one
outcome.
A compound event is any event
combining two or more simple events.
Compound Event: Getting a number
Compound
Event
Group Activity
Consider the given
situation. Use the tree
diagram below in
answering the
questions that follow.
Group Activity
Consider the situation
below. Use the tree
diagram given below
in answering the
questions that follow.
Joshua played the
roulette wheel at a
fiesta carnival. If
he has a chance to
spin the wheel 5
times, what is the
experimental
probability that he
LET US STUDY THIS
EXAMPLE:
Spin
Let us
perform the
experiment
by clicking
the spin
button.
Stop
Click the
stop
button to
stop the
wheel
spinning
next
Click the
next
button to
record
the
outcome
Spin
Let us
perform the
experiment
by clicking
the spin
button.
Stop
Click the
stop
button to
stop the
wheel
spinning
next
Click the
next
button to
record
the
outcome
CATEGORY TALLY TOTAL
WIN
LOSE
TOTAL
TALLY BOARD
Spin
Let us
perform the
experiment
by clicking
the spin
button.
Stop
Click the
stop
button to
stop the
wheel
spinning
next
Click the
next
button to
record
the
outcome
CATEGORY TALLY TOTAL
WIN
LOSE
TOTAL
TALLY BOARD
Spin
Let us
perform the
experiment
by clicking
the spin
button.
Stop
Click the
stop
button to
stop the
wheel
spinning
next
Click the
next
button to
record
the
outcome
CATEGORY TALLY TOTAL
WIN
LOSE
TOTAL
TALLY BOARD
Spin
Let us
perform the
experiment
by clicking
the spin
button.
Stop
Click the
stop
button to
stop the
wheel
spinning
next
Click the
next
button to
record
the
outcome
CATEGORY TALLY TOTAL
WIN
LOSE
TOTAL
TALLY BOARD
3
2
5
P =
CALCULATE THE
EXPERIMENTAL PROBABILITY
USING THIS FORMULA
e
number of times the event occurs
total number of trials
P =
Therefore, the experimental
probability that Joshua will
win is 3/5.
e
number of times the event occurs
total number of trials
P =
e
3
5
Thank You!
Resource Page
Use these illustrations in your presentation. Happy
designing! Don't forget to delete this page before
presenting.
Press these keys while on
present mode!
B for blur
D for
drumroll
O for bubbles
U for unveil
C for confetti
M for mic
drop
Q for quiet
Any number
from 0-9 for a
timer

MATH 10 Introduction to Probability .pptx