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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?()
某企業(yè)2018年技術工占50%,2019年新招收了一批學徒工,使學徒工的比重增加了10%。假定全廠各級工資水平均無變化,則2019年職工總平均工資將()
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 ().
對全國各鐵路交通樞紐的貨運量、貨物種類等進行調查,以了解全國鐵路貨運概況。這種調查屬于()
在組距數(shù)列中,下限就是()
某班的學習按考試成績分為60分以下,60-70,70-80,80-90,90-100,這種分組()
One rule that must always be followed in constructing frequency distributions is that ().
A cumulative frequency polygon is also called ().
什么是季節(jié)變動?研究它的意義何在?如何測定季節(jié)變動?
如果居民按報告期價格購買商品需多支出40萬元,報告期商品銷售額為200萬元,則價格指數(shù)為()