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31.下圖是某校某次段考學生數學成績的累積相對次數折線圖,中間有一部分被墨水塗汙,只知道90~100分的有80人,70~80分的人占全校的23%,請問60~70分的有多少人? (A)23(B)28(C
問題詳情
31.下圖是某校某次段考學生數學成績的累積相對次數折線圖,中間有一部分被墨水塗汙,只知道90~100分的有80人,70~80分的人占全校的23%,請問60~70分的有多少人?
(A)23
(B)28
(C)45
(D)60
參考答案
答案:C
難度:
適中
0.429
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二、若一母體分成三層,且各層母體總數為N1=30,N2=600與N。N3=500。又根據過去的調查結果知道這三層的母體標準差值分別為S1=150,S2=75與S3=100,設各層配置比例分别為P1=P
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