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統計： A(1), B(0), C(0), D(0), E(1) #1087694

詳解 (共 1 筆)

#1471452
答案為ACE
(A)a40=C(100,40)*(1/2)^100,a60=C(100,60)*(1/2)^100
(B)a40=C(100,40)*(1/2)^100,a41=C(100,41)*(1/2)^100
(C)a60=C(100,60)*(1/2)^100,a61=C(100,61)*(1/2)^100
(D)Var(X)=25

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