某公司估計(jì)在一定時(shí)間內(nèi)完成某項(xiàng)任務(wù)的概率如下:
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為什么在計(jì)算平均指標(biāo)的基礎(chǔ)上還有必要進(jìn)一步計(jì)算變異指標(biāo)?
變量數(shù)列中,各組頻率之和應(yīng)()
某企業(yè)的生產(chǎn)計(jì)劃完成百分比采用如下分組,請(qǐng)指出哪項(xiàng)是正確的()
The number of class intervals in a frequency distribution is usually between ().
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過(guò)四個(gè)車間,這四個(gè)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?
品合格率指標(biāo)是()
最能反映離散程度的指標(biāo)是()
If the individual class frequency is divided by the total frequency, the result is the ().
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?()
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()