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:
您可能感興趣的試卷
你可能感興趣的試題
最新試題
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()
某廠某年職工勞動(dòng)生產(chǎn)率為20000元,是歷史最高水平的1.2倍。這里的1.2倍是()
Which of the following statements is not true?()
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 ().
Descriptive statistics deals with methods of()
A cumulative frequency polygon is also called ().
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()
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()
If the individual class frequency is divided by the total frequency, the result is the ().