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Random Variables
hard
0:00.0
If
X
X
X
has MGF
M
X
(
t
)
=
e
t
2
/
2
M_X(t) = e^{t^2/2}
M
X
(
t
)
=
e
t
2
/2
, find
E
[
X
4
]
E[X^4]
E
[
X
4
]
.
A
0
B
1
C
3
D
6
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