[計量] 兩題計量請教一下~~~謝謝

看板GRE作者icekingking (愛斯金恩金恩)時間15年前 (2011/04/09 13:40)推噓4(4推 0噓 4→)

留言8則, 3人參與討論串1/1

1. If 55 percent of a group of people have brown hair and 80 percent of the same group do not have red hair, what fraction of those woh do not have brown hair have red hair? ANS:4/9 原本想說設brown hair為p red hair為q 然後求~p^q (記得之前高中好像可以化減) 不過想不起來怎麼算了... 後來再看一下題目想說應該是我想太複雜,題目應該是要問 don't have brown hair/have red hair => 45percent/20percent = 9/4 和答案剛好倒數~~不知哪邊錯了,所以麻煩幫忙解答一下?? 2.A certain money market account that had a balance of $48000 durning all of last month earned $360 in interest for the month. At what simple annual interest rate did the account earn intterest last month ? ANS:9% (48000-360)X annual interest rate = 360 ----不知道是哪邊算錯了 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 163.32.125.171

推

ss1132

04/09 14:02, , 1^F

04/09 14:02, 1^F

推

ss1132

04/09 14:05, , 2^F

04/09 14:05, 2^F

→

icekingking

04/09 15:03, , 3^F

04/09 15:03, 3^F