A.15次方
B.16次方
C.17次方
D.18次方
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A.1.2
B.0.8
C.1.25
D.0.83
A.比例相对指标
B.结构相对指标
C.比较相对指标
D.强度相对指标
A.比例相对数
B.计划完成相对数
C.强度相对数
D.动态相对数
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 approximate range of the number of phone calls arriving each hour？（）
A.80
B.200
C.20
D.100
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？（）
A.80
B.0.40
C.155
D.75
A.a graph of a frequency distribution
B.a running total of the frequencies in the classes
C.the proportion of the total frequencies which fall into each class
D.a very cloudy picture of the frequencies
A.histogram
B.ogive
C.stem and leaf chart
D.pie chart
最新试题
Descriptive statistics deals with methods of（）
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 （）.
企业生产一种产品需顺次经过四个车间，这四个车间的废品率分别为1.5%、2.0%、2.0%和1.0%。该企业生产这种产品的平均废品率是多少？
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？（）
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
最能反映离散程度的指标是（）
One advantage of a stem and leaf plot over a frequency distribution is that （）.
某企业的生产计划完成百分比采用如下分组，请指出哪项是正确的（）
某厂某年职工劳动生产率为20000元，是历史最高水平的1.2倍。这里的1.2倍是（）