證券分析人員為了研究資金運用效率對制造商收益的影響，隨機(jī)抽取了5個公司，得到如下資料：
要求計算：
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One rule that must always be followed in constructing frequency distributions is that （）.
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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？（）
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