某建筑公司投標(biāo)了兩項工程。該公司對投標(biāo)的所有可能結(jié)果主觀分配的概率如表：
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某建筑公司投標(biāo)了兩項工程。該公司對投標(biāo)的所有可能結(jié)果主觀分配的概率如表：
A.變窄
B.變寬
C.不變
D.不能確定
A.要寬
B.要窄
C.相同
D.可能寬也可能窄
A.正態(tài)分布
B.只有當(dāng)n＜30時，為正態(tài)分布
C.只有當(dāng)n≥30時，為正態(tài)分布
D.非正態(tài)分布
A.足夠大時
B.足夠小時
C.無論大與小
D.無法判斷
最新試題
One advantage of a stem and leaf plot over a frequency distribution is that （）.
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the cumulative frequency of the third class？（）
Which of the following is not the goal of descriptive statistics?（）
A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of （）.
Which of the following statements is not true？（）
如果居民按報告期價格購買商品需多支出40萬元，報告期商品銷售額為200萬元，則價格指數(shù)為（）
Descriptive statistics deals with methods of（）
The number of class intervals in a frequency distribution is usually between （）.
品合格率指標(biāo)是（）
If the individual class frequency is divided by the total frequency, the result is the （）.