[計量] 跪求大大們解答OG2

看板GRE (GRE入學考試)作者hankboy ( 身體健康)時間13年前 (2012/08/19 20:26)推噓0(0推 0噓 0→)

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作OG2題目發現了一些問題，但是怎麼想也想不出解答，懇請大大們指導，謝謝 1. List l consists of the numbers 1, 根號2, x and x平方, where x> 0, and the range of the numbers in list L is 4. 求大小。 Quantity A Quantity B X 2 Ans: A 想請教，x不是應該是>0, 平方最大值為4的任何數皆可能嗎？為什麼X 會大於2 2. 10,10,10,10,8,8,8,8,12,12,11,y. The twelve numbers shown represent the ages, in years, of the twelve hourses on a certain city block. What is the median age, in years, of the twelve houses on the block? Ans 10 3. The quantities S and T are positive and are related by the equation S = K/T, where K is a constant. If the value of S increases by 50 percent, then the value of T decreases by what percent? (A) 25% (B) 33 1/3% (C) 50% (D) 66 2/3% (E) 75% Ans: B 4. The probality that both events E and F will occur is 0.42. Quantity A Quantity B The probability that event E will occur 0.58 Ans: D不一定 5. If a is the smallest prime number greater than 21 and b is the largest prime number less than 16, than ab = (A) 299 (B) 323 (C) 330 (D) 345 (E) 351 Ans: A 6. For the 3 numbers in a list, the average (arithmetic mean) and the median are equal to 8. if the greast number in the list is 10 greater than the least number, what is the greast number in the list? 此題沒找到解答，想請問該如何解？ -- 倚樓聽風雨淡看江湖路每個人的一生，都可以說是一曲戲.有些人極具魅力，一生可說是一曲引人人勝的戲；且撇開了這些特殊份子，大部份人的一生，皆在胡糊塗塗、漫無目標中混過。 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 36.236.128.25