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Which of the following statements is not true?()
The number of class intervals in a frequency distribution is usually between ().
以2000年a0為最初水平,2016年an為最末水平,計算鋼產量的年平均發(fā)展速度時,須開()
某廠某年職工勞動生產率為20000元,是歷史最高水平的1.2倍。這里的1.2倍是()
如果居民按報告期價格購買商品需多支出40萬元,報告期商品銷售額為200萬元,則價格指數為()
If the individual class frequency is divided by the total frequency, the result is the ().
最能反映離散程度的指標是()
要了解某地區(qū)全部大學生的就業(yè)情況,那么()
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 ().
變量數列中,各組頻率之和應()