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問答題

【簡答題】為什么在計算平均指標的基礎(chǔ)上還有必要進一步計算變異指標？

答案：在計算平均指標的基礎(chǔ)上，進一步計算變異指標是必要的，因為變異指標能夠反映一組數(shù)據(jù)的離散程度，即數(shù)據(jù)分布的波動性或分散性。...

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單項選擇題

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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