證券分析人員為了研究資金運(yùn)用效率對(duì)制造商收益的影響，隨機(jī)抽取了5個(gè)公司，得到如下資料：
要求計(jì)算：
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If the individual class frequency is divided by the total frequency, the result is the （）.
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)？
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 approximate range of the number of phone calls arriving each hour？（）
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
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？（）
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Which of the following statements is not true？（）
以2000年a0為最初水平，2016年an為最末水平，計(jì)算鋼產(chǎn)量的年平均發(fā)展速度時(shí)，須開（）
什么是季節(jié)變動(dòng)？研究它的意義何在？如何測(cè)定季節(jié)變動(dòng)？
One advantage of a stem and leaf plot over a frequency distribution is that （）.