 > , (| − | > )→ → ∞
,∈E<∞
E( ) = E E 6=
, ..., E<∞
( + ... + ) = ( ) + ... + ( )
( )
µ=E=P=E=P=µ
( ) = E(−E) = E X
=
(−µ)!
=E X
=X
=
(−µ)( −µ)!
=X
=
E(−µ) + X
=
−
X
=
E(−µ)( −µ)
( = )
≤<≤ ≤ <≤
( ) + ... + ( )
E(−µ)( −µ) = E−µE−µE+µ µ
=E−µ µ
( ) = ( )
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