2026知到答案 概率论与数理统计（宁波大学） 最新智慧树满分章节测试答案

第二章 单元测试

1、单选题：
设随机变量 具有对称的概率密度函数，即 ，其分布函数为 ，则 （ ）
选项：
A:
B:
C:
D:
答案: 【】

2、单选题：
设随机变量 ，则随着 增大，概率 的趋势为（ ）
选项：
A:保持不变
B:增减不定
C:单调递减
D:单调增大
答案: 【保持不变】

3、单选题：
设随机变量 的概率密度函数 是偶函数，分布函数为 ,则下列命题正确的是（ ）。
选项：
A: 为奇函数
B:.w65519885302s .brush0 { fill: rgb(255,255,255); } .w65519885302s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885302s .font0 { font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885302s .font1 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885302s .font2 { font-size: 321px; font-family: Symbol, serif; } .w65519885302s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2()()1 FxFx –=
C: 为偶函数
D:.w65519885324s .brush0 { fill: rgb(255,255,255); } .w65519885324s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885324s .font0 { font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885324s .font1 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885324s .font2 { font-size: 321px; font-family: Symbol, serif; } .w65519885324s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()()1 FxFx +-=
答案: 【.w65519885324s .brush0 { fill: rgb(255,255,255); } .w65519885324s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885324s .font0 { font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885324s .font1 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885324s .font2 { font-size: 321px; font-family: Symbol, serif; } .w65519885324s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()()1 FxFx +-=】

4、多选题：
设 .w65519885283s .brush0 { fill: rgb(255,255,255); } .w65519885283s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885283s .font0 { font-size: 227px; font-family: “Times New Roman”, serif; } .w65519885283s .font1 { font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885283s .font2 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885283s .font3 { font-style: italic; font-size: 321px; font-family: Symbol, serif; } .w65519885283s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 22 ~(,4),~(,5) XNYN mm ,若 .w65519885266s .brush0 { fill: rgb(255,255,255); } .w65519885266s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885266s .font0 { font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885266s .font1 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885266s .font2 { font-style: italic; font-size: 321px; font-family: Symbol, serif; } .w65519885266s .font3 { font-size: 321px; font-family: Symbol, serif; } .w65519885266s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } (4),(5) pPXqPY mm =£-=³+ ，则下列不正确的有（ ）。
选项：
A:对任意实数 .w65519885209s .brush0 { fill: rgb(255,255,255); } .w65519885209s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885209s .font0 { font-style: italic; font-size: 321px; font-family: Symbol, serif; } .w65519885209s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } m 都有 .w65519885188s .brush0 { fill: rgb(255,255,255); } .w65519885188s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885188s .font0 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885188s .font1 { font-size: 321px; font-family: Symbol, serif; } .w65519885188s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } pq <
B:对任意实数 .w65519885203s .brush0 { fill: rgb(255,255,255); } .w65519885203s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885203s .font0 { font-style: italic; font-size: 321px; font-family: Symbol, serif; } .w65519885203s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } m 都有 .w65519885181s .brush0 { fill: rgb(255,255,255); } .w65519885181s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885181s .font0 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885181s .font1 { font-size: 321px; font-family: Symbol, serif; } .w65519885181s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } pq ” x=”345″ y=”224″> >
C:对任意实数 .w65519885247s .brush0 { fill: rgb(255,255,255); } .w65519885247s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885247s .font0 { font-style: italic; font-size: 321px; font-family: Symbol, serif; } .w65519885247s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } m 都有 .w65519885227s .brush0 { fill: rgb(255,255,255); } .w65519885227s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885227s .font0 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885227s .font1 { font-size: 321px; font-family: Symbol, serif; } .w65519885227s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } pq =
D:对个别 .w65519885240s .brush0 { fill: rgb(255,255,255); } .w65519885240s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885240s .font0 { font-style: italic; font-size: 321px; font-family: Symbol, serif; } .w65519885240s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } m ，才有 .w65519885221s .brush0 { fill: rgb(255,255,255); } .w65519885221s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885221s .font0 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885221s .font1 { font-size: 321px; font-family: Symbol, serif; } .w65519885221s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } pq =
答案: 【对任意实数 .w65519885209s .brush0 { fill: rgb(255,255,255); } .w65519885209s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885209s .font0 { font-style: italic; font-size: 321px; font-family: Symbol, serif; } .w65519885209s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } m 都有 .w65519885188s .brush0 { fill: rgb(255,255,255); } .w65519885188s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885188s .font0 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885188s .font1 { font-size: 321px; font-family: Symbol, serif; } .w65519885188s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } pq < ;
对任意实数 .w65519885203s .brush0 { fill: rgb(255,255,255); } .w65519885203s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885203s .font0 { font-style: italic; font-size: 321px; font-family: Symbol, serif; } .w65519885203s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } m 都有 .w65519885181s .brush0 { fill: rgb(255,255,255); } .w65519885181s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885181s .font0 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885181s .font1 { font-size: 321px; font-family: Symbol, serif; } .w65519885181s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } pq ” x=”345″ y=”224″> > ;
对个别 .w65519885240s .brush0 { fill: rgb(255,255,255); } .w65519885240s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885240s .font0 { font-style: italic; font-size: 321px; font-family: Symbol, serif; } .w65519885240s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } m ，才有 .w65519885221s .brush0 { fill: rgb(255,255,255); } .w65519885221s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w65519885221s .font0 { font-style: italic; font-size: 348px; font-family: “Times New Roman”, serif; } .w65519885221s .font1 { font-size: 321px; font-family: Symbol, serif; } .w65519885221s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } pq =】

5、判断题：
连续型随机变量X的概率密度函数f(x)也一定是连续函数。（ ）
选项：
A:对
B:错
答案: 【错】