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【单选题】
有下列甲、部门职员工资数据:甲部门职员工资4000,3000,2500,2000。乙部门职员工资1800,4750,2750,5500。若要比较这两部门职员平均工资差异程度大小,用的方法是( )A.
标准差
B.
极差
C.
平均数
D.
离散系数
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Unit 2.mp3: What was Mr.Stevenson’s response to the young couple’s refusal?
A.
He was not disappointed at all because he was accustomed to it
B.
He couldn’t hide his disappointment
C.
He felt disappointed but smiled and then moved to the other side.
D.
He smiled and started to use his power of persuasion.
【简答题】空函数func的表示方法是( ),他是最简单的函数定义。