[計量] 四題數學

看板GRE (GRE入學考試)作者sabinayang (Sabina)時間18年前 (2007/10/21 15:40)推噓1(1推 0噓 0→)

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Big Book裡P.619 9. On a 50-question multiple-choice test, 3 points were given for each question answered correctly and 1 point was deducted for each question answered incorrectly. A student who answered all of the questions on the test received a total of 98 points. A: The number of questions on the test that the student answered incorrectly. B: 14 Ans: B 我一開始選D 想法是: 總分150-得分98=52 52/3=14 A column 是寫"答錯的題數" 要是在這多選題裡可以一題錯一個選項而被扣一分則可能造成錯的題數比14題多所以我選D P.623 圖表題 100% = 4,415,000 Females as a percent of the total, by occupation All occupation 38.0 Official/Administrative 20.7 Professional 41.7 Service/Maintenance 17.4 24.For state and local government employees, approximately what was the difference between the number of females employed as professionals and the number of females employed in service/maintenance occupations (A)75,000 (B)185,000 (C)765,000 (D)1,070,000 (E)1,840,000 Ans: B 我的算法是4,415,000*38/100*(41.7-17.4)/100 = 407,681.1 這數字算是比較接近B 但也沒多接近想問一下我的算法有錯嗎? 25.Which of the following statements about state and local government employees can be inferred from the data? I. Fewer than 1/3 of those in paraprofessional occupations were males. II. There were more than 5 times the number of femals in the technical occupltions as in the skilled craft occupations. III. There were more than 6 times the number of females in the professional occupations as in the official/administrative occupations. (A)I only (B)II only (C)I and II only (D)II and IIIonly (E)I, II, and III Ans:E 總覺得III是錯的因為20.7*6=124.2可是professional occupations沒有超過 P.643 28. 4-n [] 6 4-n [] 5 Which of the following symbols ahould be substituted for [] to make both of the statment s above true for all integers n such that -2 < n <= 3? (A)<= (B)< (C)= (D)> (E)>= Ans:A 要是=不可以選那A和E不就都不可以選了? 謝謝大家細心看完麻煩大家糾正我的想法哪裡有錯謝謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 59.115.157.95