问题 多项选择题

已知某商厦20个售货小组某月销售额资料,如下(单位:万元):

52 58 62 65 66 70 73 74 76 80

80 81 84 87 88 89 91 94 95 98

现要编制变量分布数列,请确定下列项目:

变量数列的分组应选择()。

A.单项变量分布数列

B.组距变量分布数列

C.等距数列

D.不等距数列

答案

参考答案:B, C

解析:因为销售额属于连续变量,故适合采用等距数列(属于组距变量分布数列)。

填空题
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John H. Johnson was born in a black family in Arkansas City in 1981. His father died in an accident when John was six. He was reaching the high school age, but his hometown offered no high school for blacks.

Fortunately he had a strong—willed caring mother. John remembered that his mother told him many times, “Son, you can be anything you want really to be if you just believe.” She told him not to depend on others, including his mother. “You have to learn success” she said. “All the people who work hard don’t succeed, but the only people who do succeed are those who work hard.”

These words, came from a woman with less than a third grade education. She also knew that believing and hard work don’t mean everything. So she worked hard as a cook for two years to save enough to take her son, who was then 15, to Chicago.

Chicago in 1933 was not the promised land that black southerners were looking for. John’s mother and stepfather could not find work. But here John could go to school, and here he learned the power of words--as an editor of the newspaper and yearbook at Du Sable High School. His wish was to publish a magazine for blacks.

While others discouraged him, John’s mother offered him more words to live by “Nothing beats a failure but a try.” She also let him pawn(典当) her furniture to get the $ 500 he needed to start the Negro magazine.  

It is natural that difficulties and failures followed john closely until he become very successful. He always keeps his mother’s words in mind:” Son, failure is not in your vocabulary!” Now John H. Johnson is one of the 400 richest people in America--worth  $150 million.

小题1: What does the story mainly want to show us?

A.The key to success for blacks.

B.The mental support John’s mother gave him.

C.The importance of a good education.

D.How John H. Johnson became successful.小题2:Why did John’s mother decide to move to Chicago?

A.Because his father died when John was very young.

B.Because life was too hard for them to stay on in their hometown.

C.Because John needed more education badly.

D.Because there were no schools for Negroes in their hometown.小题3:Which of the following statements is TRUE according to the passage?

A.John’s mother didn’t believe in or depend on others.

B.John’s mother believed one would succeed without working hard.

C.John’s mother thought one could be whatever one wanted to be.

D.John’s mother thought no one could succeed without working hard.小题4:What does the underlined sentence “Nothing beats a failure but a try.” in Passage 5 mean?

A.No failure can be beaten unless you try.

B.If you try, you would succeed.

C.A try is always followed by a failure.

D.A failure is difficult to beat, even if you try.