设随机变量X的函数Y=aX+b（a，b为常数），且EX,DX均存在，则必有 A、 EY=aEX B、 DY=aDX C、 EY=aEX+b D、 DY=aDX+b

>> 成人高等教育 / 高等数学四：概率论与数理统计

成人高等教育 / 高等数学四：概率论与数理统计

正确率：100%

设随机变量X的函数Y=aX+b（a，b为常数），且EX,DX均存在，则必有

A、
EY=aEX
B、
DY=aDX
C、
EY=aEX+b
D、
DY=aDX+b

积分

高等数学四：概率论与数理统计

参考答案：

点击查看答案

佳题速递：

当事人对行政处罚不服的，可以在接到处罚通知之日起十五日内，向作出处罚决定的机关的上一级机关申请复议，对复议决定不服的，可在接到复议决定之日起（）内，向人民法院提起诉讼。学前教育政策与法规

我国封建社会特有的一种强制离婚方式，称为（）婚姻家庭继承法

共集放大电路的输入电阻值较高，输出电阻值较小，没有电压放大作用。（）模拟电子电路

题型描述: 阅读理解The family TV show Happy Days ran for 11 years from 1974 to 1984, creating several by-product series. In one episode (一集), there was a new character, an alien from outer space. He was played by an unknown actor. People roared with laughter at his crazy antics (滑稽动作). No one had seen this type of comedy before, and they protested for more. The network administrators knew they had a new star on their hands: from that single performance, Robin Williams became the star of a brand-new comedy series, Mork and Mindy. He played the character of an alien who comes to the Earth in a giant egg-shaped spacecraft. He is friendly, and observes and reports back to his planet. He sleeps standing on his head, thinks that all eggs are spacecraft, and sometimes wears his clothes backwards. His kind new friend, Mindy, helps to take care of him. They marry, and have a child together. But Mork gives birth, and the child is actually an old man who ages backward! In addition to his work as a comedian on this and other projects, Robin Williams is also an excellent dramatic actor. Anyone who has seen his films will agree that he is a man who can make you laugh, cry, think, and feel.1.Which title suits this passage best?A. Robin Williams--An Excellent Comedy ActorB. The Family TV Show Happy DaysC. The Performance of Robin WilliamsD. The Life of Robin Williams.2.What made Robin Williams become a new star according to the passage?A. His handsomenessB. This new type of comedyC. Both A and BD. His role in Happy Days.3.What does the word ″alien″ mean in the passage?A. A creature from another worldB. A stranger from another cityC. A foreigner from another countryD. A guest from a suburban area.4.Which of the following is NOT true about the character of an alien Robin Williams played in Mork and Mindy?A. The alien sleeps standing on his headB. The alien wears his clothes backwardsC. The alien comes to the Earth in a giant egg-shaped spacecraftD. The alien comes to the Earth accidentally.5.What can you learn from the passage?A. Robin Williams is a gifted actorB. Robin Williams and Mindy married and had a childC. Robin Williams is a diligent (勤奋的) actorD. Robin Williams was famous during 1974-1984.专科英语II

学前儿童把“用皮球打小狗”理解为“小狗打皮球”，采用了理解句子的（）。学前儿童语言教育

8、美国纽约大都会艺术博物馆中有一座中国古典园林建筑，称为“明轩”，其完全是仿照网师园内的（）建造的。 A.月到风来亭 B.殿春簃 C.濯缨水阁 D.竹外一枝轩河南理工大学