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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?()
One rule that must always be followed in constructing frequency distributions is that ().
某廠某年職工勞動生產(chǎn)率為20000元,是歷史最高水平的1.2倍。這里的1.2倍是()
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()
常用的長期趨勢測定的方法有哪些?各有什么特點(diǎn)?
Which of the following statements is not true?()
變量數(shù)列中,各組頻率之和應(yīng)()
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 ().
對某班級學(xué)生的生活狀況進(jìn)行統(tǒng)計調(diào)查,下列標(biāo)志中屬于不變標(biāo)志的是()
要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()