[問題] 常態分佈問題

看板GRE作者 (林乖乖)時間12年前 (2012/06/27 12:00), 編輯推噓2(201)
留言3則, 3人參與, 最新討論串1/2 (看更多)
The mean of 600 female members normally distributed is 80 and the standard deviation is 5. Kth percentile of the female members gets score 86. The mean of 400 male members normally distributed is 75 and the standard deviation is 3. Nth percentile of the male members gets score 81. QA: K QB: N 以上是遇到的題目,我通常遇到Normal Distribution題目都會想到那個圖 就是有平均數,標準差和百分比的那個圖,但這題我卻用不出來懇請解答. answer: B -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 220.135.94.131

06/27 13:47, , 1F
(96-68)>(68-50) 這樣嗎
06/27 13:47, 1F

06/27 14:34, , 2F
懇請樓上 寫下一下算式 ~
06/27 14:34, 2F

07/05 10:16, , 3F
(81-75)/3=2 ; (86-80)/5=6/5<2 hence N > K
07/05 10:16, 3F
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文章代碼(AID): #1FweLv7i (GRE)