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问题 填空题

给出一组数：

45     21     73     90     6     40     93

（1）6的左边是（   ），右边是（   ）。   

（2）从左数，第5个是（   ），40是第（   ）个，93是第（   ）个。  

（3）用“<”把这些数排一排：（   ）<（   ）<（   ）<（   ）<（   ）<（   ）<（   ）

答案

（1）90；40；（2）6；6；7；（3）6；21；40；45；73；90；93

阅读理解

Every year people celebrate the Spring Festival in China. Usually it is in January or February. It’s the most important(重要的) festival in China. So before it comes, everyone buys many things, and they often make a special kind of food called dumplings. It means “come together”. Parents always buy new clothes for their children and children also buy presents for their parents. On the Spring Festival eve(除夕), all the family members come back home. They sing, dance and play cards. When they enjoy the meal, they give each other the best wishes(祝愿) for the coming year. They all have a good time.

小题1:Which is the most important festival in China?

A．the Mid-Autumn Festival

B．The Spring Festival

C．Children’s Day

D．May Day小题2:The Chinese usually have their Spring Festival in________ .

A．January or February

B．February or march

C．September or October

D．December or January小题3:．What’s the special kind of food for the Spring Festival in China?

A．Fruit

B．Fish

C．Dumplings

D．chicken小题4:The food dumpling means “_________”

A．be nice

B．be hungry

C．come together

D．come back小题5:When Chinese people are having dinner on the Spring Festival eve, they ____.

A．sing, dance and play cards

B．buy each other presents

C．never drinks

D．never sings
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多项选择题

大样本均值的抽样分布的特征是（）。

A.分布是均匀的

B.分布是正态的

C.分布的均值等于总体均值

D.分布的标准差等于均值的标准误差

E.分布的标准差等于总体标准差除以样本容量的平方根
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