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
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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
A.3 and 5
B.7 and 9
C.5 and 15
D.1 and 25
最新試題
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
One advantage of a stem and leaf plot over a frequency distribution is that （）.
One rule that must always be followed in constructing frequency distributions is that （）.
品合格率指標(biāo)是（）
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（）
某企業(yè)的生產(chǎn)計劃完成百分比采用如下分組，請指出哪項是正確的（）
The number of class intervals in a frequency distribution is usually between （）.
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 summary measure that is computed from a sample to describe a characteristic of the population is called（）