某商場準(zhǔn)備在商場內(nèi)安裝充電式應(yīng)急照明燈,通過招標(biāo)收到3家照明燈生產(chǎn)商的投標(biāo)。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(jī)抽取了5個進(jìn)行檢驗(yàn),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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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 ().
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A cumulative frequency polygon is also called ().