问题 单项选择题

下表中,第一行依次列出了0.00,0.01,0.02,0.03,…,0.99,共100个数据;对第一行的每个数据采用方法1处理后形成第二行数据;对第一行的每个数据采用方法2处理后形成第三行数据。

方法1是对末位数字采用4舍5入处理,即末位数字是4或4以下时舍去,若末位数字是5或5以上,则进1。

方法2对4舍5入法做了如下修改:如果末位数字是5,则并不总是入,而需要根据前一位数字的奇偶性再决定舍入:如果前一位数字是偶数,则将5舍去;如果前一位数字是奇数,则进1。例如,0.05将舍入成0.0;0.15将舍入成0.2。

通过对这三行数据分别求算术平均值,可以看出:在处理一批正数时,方法1(通常的4舍5入法)与方法2(修改后的4舍5入法)相比,()。

A.方法1 与方法2 都不会产生统计偏差(舍与入平均相抵)

B.方法 1 不会产生统计偏差,方法2 产生偏高结果

C.方法 1 产生偏低结果,方法2 不会产生统计偏差

D.方法 1 产生偏高结果,方法 2 改进了方法 1

答案

参考答案:D

阅读理解

阅读理解。

    A judge was working in his room one day when a neighbour ran in and said, If one man's cow kills

another's, is the owner of the first cow responsible?

    It depends, answered the judge. Well, said the man, your cow has killed mine.

    Oh, answered the judge. Everyone knows that a cow cannot think like a man, so a cow is not responsible,

and that means that its owner is not responsible either.

    I am sorry, Judge, said the man. I made a mistake. I meant that my cow killed yours.

    The judge thought for a few seconds and then said, When I think about it more carefully, this case is not

as easy as I thought at first. And then he turned to his clerk and said, Please bring me that big blackbook

from the shelf behind you.

1.The neighbour asked the judge ______. [ ]

A.whether the first cow was responsible

B.whether the owner of the first cow was responsible

C.whether both cows were responsible

D.whether both the owners were responsible

2.When the neighbour reported that the judge's cow had killed his, the judge answered that ______. [ ]

A.a cow was reponsible

B. its owner was not responsible

C.neither a cow nor its owner was responsible

D.his cow was responsible

3.When the neighbour heard this, he told the judge that ______. [ ]

A.there was nothing happened

B. his cow had been killed

C.it was his cow that had killed the judge's

D.both cows had been killed

4.When the judge heard that his cow had died, he ______. [ ]

A.got angry

B.said nothing

C.put his neighbor into prison

D.changed what he had said at first

5.In this story the judge was ______. [ ]

A. a clever judge

B.a humorist

C.unfair

D.foolish

多项选择题