Re: [計量] 請教 數學問題
※ 引述《peilinchen (peilin)》之銘言：
: A political poll showed that 80 percent of those polled said they would
: vote for proposition P. Of those who said they would vote for proposition P
: 70 percent actually voted for P, and of those who did not say they would
: voted for P, 20 percent actually voted for P. What percent of those polled
: voted for P?
: (A) 56%
: (B) 60%
: (C) 64%
: (D) 76%
: (E) 90%
: ANS:B
設投票總人數為x
80%x說會投給P，但實際上80%x的70%投給P所以是56%投給P。
20%x說不投P，但實際上20%x的20%投給P所以是4%投給P。
56%+4%=60%。
--
推
,
推
,
推
,
推 KeeperOf7Key:因為id長度剛好樓上另類的推齊了XDDDD - Share板天然推齊運動 -
推
,
推
,
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.59.125.143
討論串 (同標題文章)
GRE 近期熱門文章
PTT職涯區 即時熱門文章
805
1489