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【简答题】
已知某班级数学考试成绩总体符合正态分布 N ( 76,16 ),现从班级中抽调 1 名同学参加单独数学考试获得了 89 分,试问该名抽调的同学这次考试的数学成绩与全班数学平均成绩是否有差异? 请将解答结果填入下面表格中: 编号 项目类别 计算结果 1 数学成绩总体均值 2 数学成绩总体标准差 3 P (数学成绩 >89 分) 4 判断结果 注:判断结果是否有差异请填写“是”或“否”。
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皮皮学刷刷变学霸
举一反三
【判断题】在屏面上,十字形比三角形更容易辨认。
A.
正确
B.
错误
【判断题】No es recomendable que un exportador acepte vender bajo las condiciones de la carta de crédito irrevocable confirmado pagadora a la vista.
A.
正确
B.
错误
【单选题】The teacher’s words helped the students gain () into the problem.
A.
ideas
B.
views
C.
insight
D.
understanding
【单选题】In class, the students are __________ in the teacher’s words.
A.
losing
B.
absorbed
C.
attracted
D.
addicted
【单选题】______ time went on, the teacher's words proved true.
A.
As
B.
While
C.
With
D.
When
【单选题】Why weren't the teacher's books good enough for Louis?
A.
The words were so hard.
B.
The words took up so much space.
C.
It took so long to read a book.
D.
It was difficult to read.
【判断题】No es recomendable que un exportador acepte vender bajo las condiciones de la carta de crédito irrevocable confirmada pagadera a la vista.
A.
正确
B.
错误
【简答题】Es recomendable que (hacer) tus deberes en casa.
【单选题】The teacher’s words left us _______ .
A.
think
B.
to think
C.
thought
D.
thinking
【单选题】After the teacher’s words,all the students in the class _________.
A.
1ooked very serious
B.
thought they would be rich
C.
began to think about their designs
D.
began to play games
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