求大神帮助!高分悬赏!急急急!!!!!!概率论与数理统计

2024-12-11 18:36:51
推荐回答(1个)
回答1:

1~10: CBCDD BACDB

1~ 5: 0.3 0.58 0.21 1 C(i,4) * 0.7^i * 0.3^(4-i)
6~10: 0.6826 1/9 1/12 9/16 5/16

1、(1) Px=0.9*(1-0.3*0.2)=0.846
(2)P(ac|x) = P(acx)/P(x) = P(x|ac)P(ac) / P(x) = 1×0.63/0.846

2、分布律: X 1 2 3
P 0.8 0.18 0.02

1、证:E(X) = 0 , E(Y) =0 ,E(XY) = 0
cov(X,Y) = { E[X-E(X)] [Y-E(Y)] } = E (XY) =0 ,所以 X,Y 不相关
P(-1, · )P( ·, -1) = 9/64 ≠ 1/8 所以 X,Y 不是相互独立 #

2、 a=3/16
0 x<=0
F(x)={ 1/8 * x^(3/2) 0 1 x>4
P= 1-F(1) = 1/4

五、记x为订日报,记y为订晚报
p(C) = p (x∪y) = p(x)+(y)-p(xy) = 0.32
p(E) = 1 - p(C) = 0.68
p(D) = 1 - p(E) - p(xy) = 0.24

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