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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
最新試題
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a （）.
A cumulative frequency distribution would provide（）.
某班的學(xué)習按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）
If the individual class frequency is divided by the total frequency, the result is the （）.
One advantage of a stem and leaf plot over a frequency distribution is that （）.
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
Which of the following statements is not true？（）
The number of class intervals in a frequency distribution is usually between （）.
最能反映離散程度的指標是（）
以2000年a0為最初水平，2016年an為最末水平，計算鋼產(chǎn)量的年平均發(fā)展速度時，須開（）