、设随机变量 approx P(lambda ), 已知 (X=1)=P(X=2), 则 P(X=4)=-|||-A) dfrac (1)(3)(e)^2 (B
若随机变量 sim B(5,dfrac (1)(3)), 则P(X-|||-=3) 等于 ( )-|||-
设随机变量 X ~ N ( 0.1 ),则 P ( X≥0 ) = ( ) A dfrac (1)(2) : B dfrac (1)(2): C dfrac (
设随机变量 -[ dfrac (-1)(a)bdfrac (1)(6)] 且 ||X|=1 =P X=0 , 则常数a,b的值为-|||-bigcirc
[题目]设随机变量x服从均匀分布 backsim U(a.b) 且-|||-(X)=2, (X)=dfrac (1)(3), 则参数a,b的值为 ()-|||-
1.设随机变量X ~ N(5, 25) , 则P(X≤5)=____1.设随机变量X~N(5,25),则P(X≤5)=____
3.[填空题]-|||-设随机变量X服从B(2,p),且 Xgeqslant 1 =dfrac (5)(9)-|||-则 p= __
(14)设随机变量X的概率分布为 X=-2 =dfrac (1)(2) , X=1 =a, X=3 =b, 若 =0,-|||-则 = __
设随机变量X的分布律为P(X=k) =k / 6,k=1,2,3,则P(2 ≤ X ≤ 3) =A 1 / 3 B 5 / 6 C 1 / 2 D 1 / 6设
设随机变量X~U(0,3),则P(1≤XA. 1/3B. 2/3C. 1/4D. 3/4