有2袋水果,第一袋中3個蘋果2個橘子,第二袋中5個蘋果3個橘子,問每袋拿一個正好一個蘋果一個橘子的概率。。。[
閱讀全文]
http://web.wenxuecity.com/BBSView.php?SubID=style&MsgID=1498653[
閱讀全文]
Twoofthemostimportantconceptsininvestingarereturnandrisk.Ifreturnsofsecuritiesareviewedasrandomvariables,thentherewardofaportfoliocanbemeasuredastheexpectation,ormean,oftheportfolioreturnanditsriskcanbemeasuredasthevarianceoftheportfolioreturn.Ofcourse,manyotherapproachesarepossible,butmean-variance
analysisisoneofthesimplestandmostpowerful.ThisapproachwassuggestedbyHarryMarkowitz,whowontheNob...[
閱讀全文]