[問題] 請問幾題數學

看板GRE (GRE入學考試)作者DREAM11 (夢魂新苑)時間14年前 (2011/06/09 00:54)推噓2(2推 0噓 3→)

留言5則, 2人參與討論串1/2 (看更多)

請問幾題GRE的數學...謝謝<(_ _)> For certain farm, soybean production increased by 25 percent from year X to year Y, and the selling price of soybeans decreased by 25 percent from year X to year Y. If the entire soybean production was sold each year, approximately what was the percent change in the revenues from the sale of the soybeans from year X ti year Y? (A) 56% decrease (B) 6% decrease (C) No change (D) 6% increase (E) 56% increase Answer: B ---------------------------------------------- p.223 Which of the following sets of numbers has the greastest standard deviation? (A) 2,3,4 (B) 2.5, 3 , 3.5 (C) 1, 1.25, 1.5 (D) -2 , 0 , 2 (E) -20 , 21 , 21.5 Answer: D (為什麼不是E呢 @@) --------------------------------------------- p.224 Workers at Companies X and Y are paid the same base hourly rate. Workers at Company X are paid 1.5 times teh base hourly rate for each hour worked per week 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? (A) 46 (B) 45 (C) 44 (D) 43 (E) 42 Answer: B --------------------------------------------- p.226 The numbers in the list above are ordered from least to greastest. If the average (arithmetic mean) is 2 grater than the median, what is the value of x ? (A) 22 (B) 20 (C) 17 (D) 16 (E) 15 Answer : A (請問...它的題目是不是沒有給完整呢) ------------------------------------------------ p.227 a _______________________ b _____________________________ ab ___________________________________ The length of the line segments are a, b , and ab, respectively. The line segments are drawn to scale. 問: a 和 1 誰比較大? Answer: A (是不是題目不完整@@) ------------------------------------------------- 以上...麻煩了!! 謝謝<(_ _)> -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.223.231.198