Re: [計量] 陳向東最新數學預測試題

看板GRE (GRE入學考試)作者miomio0322 (冒煙的LEO)時間17年前 (2008/10/09 16:10)推噓2(2推 0噓 8→)

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※ 引述《bubbb (bubbb)》之銘言： : ※ 引述《miomio0322 (冒煙的LEO)》之銘言： : : 想請問第一回的題目 : : 因為是新手，要是有沒有注意到禮貌的地方請多包涵 : : 8.A political poll showed that 80 percent of those polled said they : : would vote for proposition P, 70 percent actually votedd for P, : : and of those who did not say they would vote for P, 20 percent of those : : polled voted for P. : : What percent of those polled voted for P ? : : (這題題義有點看不懂) : 80%的人說要投給P 但是只有70%的人真的有投給P : 在剩下20%的人之中 : 有20%的人投給P : 問有多少%的人投給了P? : 70% + 20% * 20% = 74% : : 11.(圖表題)第三個選項要如何判斷 : : 16.要怎麼判斷才會比較快算出大小(省一點時間) : : (1)1/2+1/3 : : (2)7/8+3/20 : : (3)15/16+2/40 : : (4)12/25+12/30 : : (5)35/102+2/3 : 通分到100 : (1) 50/100 + 33.3/100 = 83.3/100 : (2) 87.5/100 + 15/100 = 102.5/100 : (3) 90/100 + 5/100 = 95/100 : (4) 48/100 + 39.6/100 = 87.6/100 : (5) 35/100 + 66/100 = 101/100 : 我覺得都取大概比較好算吧@@ : 其實我也不確定這樣會不會有很大誤差... : 有錯請鞭小力點ˊˋ : : 17. S is the sum fo the first n negative integer powers of 2. : : S=2^(-1)+2^(-2)+......2^(-N) : : S 1 : : (我是根據等比級數公式S=A/(1-R)) 算出來覺得應該是C選項 : : 可是答案是B，是不是我哪裡算錯了呢 : : 謝謝各位大大 : S會逼近1 但是不會等於1 : S = 1/2 + 1/4 + 1/8 + ... : 所以最後還謝謝大大還有一題的提議也可以幫我看一下嘛 workers at companies X and Y are paid the same base hourly rate. workers at company X are 1.5 times the base hourly rate for each hour worked per worked in excess of the first 37, while workers at company Y are paid 1.5 times the base hourly rate for each hour worked per week in excess of the first 40. In a given week, how many hours must a company X worker work in order to receive the same pay as a company Y worker who works 46 hours 謝謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 210.62.247.245