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Probability
Mathematics, Grade 3
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Study Guide Probability Mathematics, Grade 3
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2
❯
PROBABILITY
What
Is
Probability?
•
Probability
is
the
chance
that
a
particular
event
will
occur.
•
There
are
four
different
ways
to
show
the
probability:
o
One
way
is
to
show
the
certainty:
certain,
likely,
somewhat
likely,
not
likely,
impossible
o
The
other
three
ways
are
with
numbers.
These
include
the
number
of
chances
with
the
total
number
of
occurrences.
If
the
probability
of
an
event
happening
is
3
out
of
5,
it
could
also
be
written
like
this:
3:5
or
3/5.
How
to
figure
out
probability:
•
The
probability
of
an
event
occurring
is
how
likely
it
is
to
happen.
For
example:
You
have
a
bag
of
marbles
with
3
red,
4
blue,
and
5
green.
What
is
the
probability
you
will
choose
an
orange
marble?
Since
there
are
no
orange
marbles
in
the
bag,
the
probability
would
be
impossible.
What
would
be
the
probability
of
choosing
a
red,
blue,
or
green
marble?
Since
there
are
only
red,
blue,
and
green
marbles
in
the
bag,
the
probability
would
be
certain.
•
The
probability
that
an
event
will
occur
is
the
number
of
chances
there
are
out
of
the
total
number
of
occurrences.
For
example:
You
have
a
bag
of
marbles
with
3
red,
4
blue,
and
5
green.
What
is
the
probability
you
will
choose
an
orange
marble?
Again,
since
there
are
no
orange
marbles
in
the
bag,
the
probability
would
be
0
out
of
12.
What
is
the
probability
of
choosing
a
red
marble?
Since
there
are
3
red
marbles
and
there
are
12
marbles
all
together,
the
probability
of
choosing
a
red
marble
from
the
bag
would
be
3
out
of
12
or
3:12
or
3/12.
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Permission
is
granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
Try
This!
Find
the
probability
of
the
following.
If
a
number
cube
has
the
numbers
1
through
6
on
it,
what
is
the
probability
an
even
number
will
be
rolled?
_______________________________________
A
box
of
crayons
has
2
blue,
5
green,
3
yellow,
and
5
red
crayons
in
it.
What
is
the
probability
of
choosing
a
green
crayon?
_______________________________________
© Copyright NewPath Learning. All Rights Reserved.
Permission
is
granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
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