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【多选题】
设随机变量 X 服从 N(2, 2 2) , 且 Y = aX + b 服从 N(0, 1) , 则 ( ) .≤
A.
a = 2 , b = − 2
B.
a = − 2 , b = − 1
C.
a = 0.5 , b = − 1
D.
a = − 0.5 , b = 1
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