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抽取了5個進行檢驗，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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變量數(shù)列中，各組頻率之和應(yīng)（）
Descriptive statistics deals with methods of（）
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？（）
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A summary measure that is computed from a sample to describe a characteristic of the population is called（）
為什么在計算平均指標(biāo)的基礎(chǔ)上還有必要進一步計算變異指標(biāo)？
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One advantage of a stem and leaf plot over a frequency distribution 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？（）