作者sparrow620 (可遇不可求′-`y-～)
看板Grad-ProbAsk
標題[商管] 有一題統計想請教
時間Fri Nov 26 19:49:23 2010
假設有一銷售員的monthly salary 服從uniform分配
so let r.v X~U(50000,70000)
a.What are the expected value and standard deviation of his monthly salary?
b.If he has to pay alimony to his ex-wife and he has the following two plans
to choose from：(1) 20% of his monthly salary (2) 40% of what is left for
him after substracting $30000 from the realized monthly salary. Which plan
should he choose?
a小題按uniform distribution的特性可以得知
μ=(50000+70000)/2=60000
σ={(70000-50000)/12}^1/2
問題是b小題 那個(2) 不懂題意
是由他真實的薪水扣除30000後，他所剩的薪水的40% ???
很久沒碰統計了一時腦袋卡住...
有人可以解答嗎？ 謝謝
--
牛頓在２３歲發明了微分學，
隔年在２４歲發明了積分學。
但是他害很多人在１９歲時微積分被當，到了高等微積分再次被當...Orz
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 114.47.220.46
1F：推 serflygod:推你的簽名檔 11/26 20:10
2F：→ sparrow620:已解決 b小題EX值一樣 再算var應該就可以選擇了 11/26 23:27