某商場準備在商場內(nèi)安裝充電式應(yīng)急照明燈,通過招標收到3家照明燈生產(chǎn)商的投標。該商場從3家生產(chǎn)商提供的應(yīng)急照明燈樣品中各隨機抽取了5個進行檢驗,測得各個樣品充電后可持續(xù)照明的時間長度(小時)數(shù)據(jù)如下:
要求:
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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()
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%。假定全廠各級工資水平均無變化,則2019年職工總平均工資將()
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()
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?()
一個地區(qū)一定時期的商品零售額屬于()
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). The average number of absences per employee, calculated from the personnel data of all employees, is a ().
A cumulative frequency polygon is also called ().
If the individual class frequency is divided by the total frequency, the result is the ().
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個車間,這四個車間的廢品率分別為1.5%、2.0%、2.0%和1.0%。該企業(yè)生產(chǎn)這種產(chǎn)品的平均廢品率是多少?
為什么在計算平均指標的基礎(chǔ)上還有必要進一步計算變異指標?