102年經建的普考統計學概要 - 普考
By Edith
at 2013-07-22T05:48
at 2013-07-22T05:48
Table of Contents
普考統計第二大題
已知一組n=200資料分布為鐘型分配 平均數60 標準差10
第1小題略
第二小題 有多少觀察直超過75??
以下為原始題目
http://wwwc.moex.gov.tw/ExamQuesFiles/Question/102/102090_41530.pdf
想法
我的疑問是 鐘型分配 和對稱鐘型有一樣嗎?
我知道對稱鐘型就是常態分配
那這題應該要用單邊柴比雪夫 還是用常態分配標準化呢??
因這兩個答案算出來 答案差很多
如果用單邊柴筆雪夫
P(X>75) < (10^2)/(10^2+15^2)=0.3077
200*0.3077 約=61
如果用常態分配標準化 P(X>75)=P(Z>1.5)=0.0668
200*0.0668 約=13
因為此張考卷第三大題考的是常態分配 我想說怎麼連續兩題都考常態分配
因此推估第二大題第二小題 應該考的是單邊柴比雪夫 這樣對嗎?
還是說 第二大題第二小題 用常態分配標準化也可以呢??
麻煩各位高手了 謝謝
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普考
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