Simple Events Worksheets Page 2
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5Outcomes occur at random if each outcome occurs by chance.
For example, rolling a number on a number cube occurs at random.
2
TALENT COMPETITION
Simone and her three friends were
deciding how to pick the song they will sing for their
school’s talent show. They decide to roll a number cube.
The person with the lowest number chooses the song.
If her friends rolled a 6, 5, and 2, what is the probability
that Simone will get to choose the song?
The possible outcomes of rolling a number cube are 1, 2, 3, 4, 5, and 6.
In order for Simone to be able to choose the song, she will need to
roll a 1.
Let P(A) be the probability that Simone chooses the song.
___
number of favorable outcomes
P(A) =
number of possible outcomes
_
1
=
There are 6 possible outcomes, and 1 of them is favorable.
6
_
1
The probability that Simone will choose the song is
, or about 17%.
6
MUSIC
The table shows the
New York Philharmonic
numbers of brass instrument
Brass Instrument Players
players in the New York
Horn
6
Philharmonic. Suppose one
Trombone
4
brass instrument player is
Trumpet
3
randomly selected to be a
Tuba
1
featured performer. Find the
Source: New York Philharmonic
probability of each event. Write
as a fraction in simplest form.
P(trumpet)
P(brass)
d.
e.
P(flute)
P(horn or tuba)
f.
g.
The probability that an event will happen can be any number from
0 to 1, including 0 and 1, as shown on the number line below. Notice
that probabilities can be written as fractions, decimals, or percents.
As likely to
Impossible
happen as not
Certain
Unlikely
Likely
1
1
3
0
1
4
2
4
0
0.25
0.5
0.75
1
0%
25%
50%
75%
100%
461
Lesson 9-1 Simple Events
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