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#import "@preview/numbly:0.1.0": * | ||
#set enum(full: true, numbering: numbly("{1:一、}", "({2})",)) | ||
#set text(size: 14pt, font: "Source Han Serif SC") | ||
#let title(body, lev:1) = { | ||
show heading.where(level: lev): it => [ | ||
#set align(center) | ||
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#if lev == 1 { | ||
text(size: 22pt, font: "Source Han Serif SC")[#it.body] | ||
} else if lev == 2 { | ||
text(size: 18pt, font: "FZXiaoBiaoSong-B05S")[#it.body] | ||
} | ||
] | ||
heading(body, level: lev) | ||
} | ||
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#title(lev: 1)[概率论(H)2023-2024 秋冬小测] | ||
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#align(center)[#text(size: 15pt,font: "Ink Free",[shrike505])] | ||
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#title(lev: 2)[第一次小测:2024年10月11日] | ||
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+ | ||
+ 假设事件 $A, B, C$ 互不相容,且 $P(A) = P(B) = 0.2, P(C) = 0.4$. 求 $P(A dash.en(C) union B)$. | ||
+ 假设事件 $A, B$ 相互独立,且 $P(A) = 0.6, P(B) = 0.3$. 求 $A$ 与 $B$ 至少有一个发生的条件下 $A$ 发生的概率. | ||
+ 对随机事件 $A, B$,若 $P(A bar B) = 0.2, P(dash.en(A) bar dash.en(B)) = 0.3, P(B) = 0.4$,求 $P(B bar A)$. | ||
+ 在线段 $A B$ 中随机取三点 $C, D, E$, 求三线段 $A C, A D, A E$ 可构成三角形的概率. | ||
+ 投票选举甲乙两人,已知甲共得 $m$ 张,乙共得 $n$ 张,$m gt.eq n + 2$. 求在第一张票后的计票过程中,甲得票数始终至少领先乙得票数 $2$ 张的概率. | ||
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#title(lev: 2)[第二次小测:2024年11月22日] | ||
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+ 设随机变量 $xi_1, xi_2, dots, xi_n$ 相互独立,且同分布. $P(xi_1 = i) = frac(2, 3^i), i = 1, 2, dots, n$. 令 $eta = min_(1 lt.eq k lt.eq n) xi_k$ | ||
+ 求 $P(eta gt.eq i)$. | ||
+ 求 $eta$ 的分布列. | ||
+ 设 $X, Y$ 为非负整数值随机变量,$X + Y tilde P(lambda)$(泊松分布),并在给定 $X + Y = n$ 的条件下,$X tilde B(n, p)$. 求 $X, Y$ 的分布. | ||
+ 设随机变量 $X_1, X_2, X_3$ 相互独立,都服从参数为 1 的指数分布, | ||
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记 $Y_1 = frac(X_1, X_1 + X_2), Y_2 = frac(X_1 + X_2, X_1 + X_2 + X_3), Y_3 = X_1 + X_2 + X_3$. | ||
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+ 求 $(Y_1, Y_2, Y_3)$ 的联合密度函数. | ||
+ 证明 $Y_1, Y_2, Y_3$ 相互独立. |