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Statistics Examples
Step-by-Step Examples
Statistics
Probability
Find P(A∩B) for Independent Events A and B
P
(
A
)
=
0.04
P
(
A
)
=
0.04
,
P
(
B
)
=
0.02
P
(
B
)
=
0.02
Step 1
When
A
A
and
B
B
are
independent events
, the
probability
of
A
A
and
B
B
occurring is
P
(
A
∩
B
)
=
P
(
B
∩
A
)
=
P
(
A
)
⋅
(
P
(
B
)
)
P
(
A
∩
B
)
=
P
(
B
∩
A
)
=
P
(
A
)
⋅
(
P
(
B
)
)
, which is called the
multiplication
rule for
independent events
A
A
and
B
B
.
P
(
A
∩
B
)
=
P
(
B
∩
A
)
=
P
(
A
)
⋅
(
P
(
B
)
)
P
(
A
∩
B
)
=
P
(
B
∩
A
)
=
P
(
A
)
⋅
(
P
(
B
)
)
Step 2
Fill in the known values.
P
(
A
∩
B
)
=
P
(
B
∩
A
)
=
0.04
⋅
0.02
P
(
A
∩
B
)
=
P
(
B
∩
A
)
=
0.04
⋅
0.02
Step 3
Multiply
0.04
0.04
by
0.02
0.02
.
P
(
A
∩
B
)
=
P
(
B
∩
A
)
=
0.0008
P
(
A
∩
B
)
=
P
(
B
∩
A
)
=
0.0008
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⎡
⎢
⎣
x
2
1
2
√
π
∫
x
d
x
⎤
⎥
⎦
[
x
2
1
2
π
∫
x
d
x
]
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