101年初考-統計學大意 - 考試

By Valerie
at 2014-01-11T17:31
at 2014-01-11T17:31
Table of Contents
101年第39題
假設全國有收入的男女比例為6比4,男性所得的平均數為110萬,標準差為2萬,女性所得
的平均數為100萬,標準差為2萬。則全國所得的變異數最接近下列何值? A.25 B.30
C.35 D.40 答案為B
全國所得平均數的變異應該是4?
而他的全國所得的變異不是很懂他的意思,請問要求什麼且該如何求出答案的30
謝謝
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