设Xi ~ N(0 , 4), i =1, 2, 3, 且相互独立, 则 ( ) 成立。A.dfrac ({X)_(1)}(4)sim N(0,1)B.dfrac ({X)_(1)}(4)sim N(0,1)C.dfrac ({X)_(1)}(4)sim N(0,1)D.X1+X2 –X3 ~N (0, 4)

设Xi ~ N(0 , 4), i =1, 2, 3, 且相互独立, 则 ( ) 成立。
  • A.
  • B.
  • C.
  • D.X1+X2 –X3 ~N (0, 4)

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