作者查詢 / s110269
作者 s110269 在 PTT [ Math ] 看板的留言(推文), 共31則
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3F→: 感謝解說!02/26 06:50
1F推: http://imgur.com/RFDcreo06/09 02:02
1F推: 比較兩者的變異數,變異數小的表示投資風險小03/24 21:22
2F推: 乙公司的變異數=0,不像甲公司一樣大起大落03/24 21:26
2F推: 最保險的方法:放回與不放回都寫02/06 19:43
1F推:喔喔!看來我果然對機率論這章不熟...都用傳統解法06/20 16:42
2F→:台大果然厲害!06/20 16:42
2F→:哎呀,太久沒碰機率論這個章節了!(汗顏)06/20 16:44
1F推:第二題用柴比雪夫不等式06/20 15:50
2F→:所求=P(-4-8<X-8<20-8)=P(|X-8|<4×3)=1-1/1606/20 15:52
3F→:P(-4-8<X-8<20-8)=P(|X-8|<4×3)≧1-1/16 才對!06/20 15:54
4F→:15/16=0.937506/20 15:55
3F推:252的話,包含中5個號碼與6個號碼全中的情況06/20 11:43
5F推:我搞錯了,2樓的答案才是正確的06/20 15:16
5F推:中間部分也可以用P(A或B)=P(A)+P(B)-P(A且B)06/20 09:03
6F→:也就是(1/3+7/10)-(1/3×7/10)06/20 09:04