皮皮学，免费搜题
登录
搜题
【单选题】
A weighted average of the value of a random variable, where the probability function provides weights is known asA.
a probability function
B.
a random variable
C.
the expected value
D.
random function
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
【单选题】听力原文： An election year is one in which all four numbers are evenly divided by four (1944, 1940, etc. ),. Since 1840, American presidents elected in years ending in zero have been destined to die in of...
A.
1960.
B.
1824.
C.
1888.
D.
1930.
【单选题】听力原文： An election year is one in which all four numbers are evenly divided by four (1944, 1940, etc. ). Since 1840, American presidents elected in years ending in zero have been destined to die in off...
A.
1960.
B.
1824.
C.
1888.
D.
1930.
相关题目：