問答題

【簡答題】為什么在計(jì)算平均指標(biāo)的基礎(chǔ)上還有必要進(jìn)一步計(jì)算變異指標(biāo)？

答案：在計(jì)算平均指標(biāo)的基礎(chǔ)上，進(jìn)一步計(jì)算變異指標(biāo)是必要的，因?yàn)樽儺愔笜?biāo)能夠反映一組數(shù)據(jù)的離散程度，即數(shù)據(jù)分布的波動(dòng)性或分散性。...

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單項(xiàng)選擇題

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？（）

A.80
B.200
C.20
D.100

單項(xiàng)選擇題

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？（）

A.80
B.0.40
C.155
D.75

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