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
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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 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
A.the number of classes must be less than 10
B.each data point can only fall into one class
C.the width of each class is equal to the range
D.the number of intervals must be an odd number
A.it contains more class intervals
B.the values of the original data are retained
C.the class midpoints are used as the stem
D.the class midpoints are used as the leaf
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某班的學(xué)習(xí)按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
變量數(shù)列中，各組頻率之和應(yīng)（）
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（）
A cumulative frequency polygon is also called （）.
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 （）.
One advantage of a stem and leaf plot over a frequency distribution is that （）.
對全國各鐵路交通樞紐的貨運量、貨物種類等進(jìn)行調(diào)查，以了解全國鐵路貨運概況。這種調(diào)查屬于（）
Descriptive statistics deals with methods of（）
If the individual class frequency is divided by the total frequency, the result is the （）.