A.histogram
B.ogive
C.stem and leaf chart
D.pie chart
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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
A.an ogive
B.a histogram
C.a frequency polygon
D.a stem and leaf plot
A.midpoint frequency
B.cumulative frequency
C.stem and leaf plot
D.relative frequency
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最能反映離散程度的指標(biāo)是（）
某企業(yè)2018年技術(shù)工占50%，2019年新招收了一批學(xué)徒工，使學(xué)徒工的比重增加了10%。假定全廠各級(jí)工資水平均無(wú)變化，則2019年職工總平均工資將（）
A cumulative frequency polygon is also called （）.
One rule that must always be followed in constructing frequency distributions is that （）.
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 （）.
一個(gè)地區(qū)一定時(shí)期的商品零售額屬于（）
The number of class intervals in a frequency distribution is usually between （）.
在組距數(shù)列中，下限就是（）
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 （）.
如果居民按報(bào)告期價(jià)格購(gòu)買商品需多支出40萬(wàn)元，報(bào)告期商品銷售額為200萬(wàn)元，則價(jià)格指數(shù)為（）