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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
A.histogram
B.ogive
C.stem and leaf chart
D.pie chart
最新試題
品合格率指標(biāo)是（）
以2000年a0為最初水平，2016年an為最末水平，計(jì)算鋼產(chǎn)量的年平均發(fā)展速度時(shí)，須開(kāi)（）
對(duì)全國(guó)各鐵路交通樞紐的貨運(yùn)量、貨物種類(lèi)等進(jìn)行調(diào)查，以了解全國(guó)鐵路貨運(yùn)概況。這種調(diào)查屬于（）
One advantage of a stem and leaf plot over a frequency distribution is that （）.
Descriptive statistics deals with methods of（）
If the individual class frequency is divided by the total frequency, the result is the （）.
The number of class intervals in a frequency distribution is usually between （）.
Which of the following is not the goal of descriptive statistics?（）
時(shí)間序列構(gòu)成因素有哪些？分解的基本原理和思路是什么？
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）