已知X~B(n,),EX=2.4,DX=1.44,则二项分布的参数为()
( A ) n = 4 , p = 0 . 6 :
( B ) n = 6 , p = 0 . 4 :
( C ) n = 8 , p = 0 . 3 :
( D ) n = 2 4 , p = 0 . 1 .