某商場(chǎng)準(zhǔn)備在商場(chǎng)內(nèi)安裝充電式應(yīng)急照明燈,通過(guò)招標(biāo)收到3家照明燈生產(chǎn)商的投標(biāo)。該商場(chǎng)從3家生產(chǎn)商提供的應(yīng)急照明燈樣品中各隨機(jī)抽取了5個(gè)進(jìn)行檢驗(yàn),測(cè)得各個(gè)樣品充電后可持續(xù)照明的時(shí)間長(zhǎng)度(小時(shí))數(shù)據(jù)如下:
要求:
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One advantage of a stem and leaf plot over a frequency distribution is that ().
對(duì)某班級(jí)學(xué)生的生活狀況進(jìn)行統(tǒng)計(jì)調(diào)查,下列標(biāo)志中屬于不變標(biāo)志的是()
最能反映離散程度的指標(biāo)是()
如果居民按報(bào)告期價(jià)格購(gòu)買(mǎi)商品需多支出40萬(wàn)元,報(bào)告期商品銷(xiāo)售額為200萬(wàn)元,則價(jià)格指數(shù)為()
常用的長(zhǎng)期趨勢(shì)測(cè)定的方法有哪些?各有什么特點(diǎn)?
一個(gè)地區(qū)一定時(shí)期的商品零售額屬于()
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
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 ().
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過(guò)四個(gè)車(chē)間,這四個(gè)車(chē)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?
The number of class intervals in a frequency distribution is usually between ().