皮皮学，免费搜题
登录
搜题
【多选题】
关于数学期望,正确的是( )A.
粗略地说,数学期望就是随机变量的平均值
B.
设c是常数,则E(c)=c
C.
设c是常数,E(cX)=cE(X)
D.
若X,Y的期望存在,则有
E.
(XY)=E(X)E(Y) E 若X,Y的期望存在,则E(X+Y)=E(X)+E(Y)
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】阅读理解 Lily, a student of Happy International School, makes a survey about the school uniforms in her school. There are 800 students in the survey. She asks them what they think of wearing their school ...
【简答题】短文改错。 At your school, who usually makes the decision to punish the student who is found cheat in an exam or getting into a fight? 'The school authority, of course!' You would probably say. And in the ...
相关题目：