[計量] 最後幾題計量問題?

看板GRE (GRE入學考試)作者abc03301016 (123)時間16年前 (2010/04/09 13:53)推噓0(0推 0噓 0→)

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Q1. A certain characteristic in a large population has a distribution that is symmetric about the mean m.If 68 percent of the distribution lies within one standard deviation d of the mean , what percent of the distribution is less than m + d? A. 16% B. 32% C. 48% D. 84% E. 92% Q2. A seller marks the price of an article 35% more of the wholesale price and he offers some discount. If he wish to get a profit of 21.5%. What is the percentage difference between marked price and selling price? A. 12.5 B. 10 C. 25 D. 22.5 E. 15 Q3. John traveled 80% of the way from Yellow-town to Green-fields by train at an average speed of 80 miles per hour. The rest of the way John traveled by car at an average speed of v miles per hour. If the average speed for the entire trip was 60 miles per hour, what is v in miles per hour? (a) 30 (b) 40 (c) 50 (d) 55 (e) 70 Q4.Two cylindrical containers are given with circular base area of 4Pie and 8Pie. 4PI container is filled with a liquid to 3'' height and the 8Pie container to 1" height. The liquid from 4Pie container is pored into the 8Pei container till the level of liquid in both of them is equal. Find the final height of the liquid? Ans: 5/3 Q5. Roger sold a watch at a profit of 10%. If he had bought it at 10% less and sold it for $13 less he would have made a profit of 15%. What is the cost price of the watch? A) $220 B) $300 C) $400 D) $480 E) $540 Ans: A Q6.A car goes around a circle of radius of 14km in the first round it travels with a speed of 11km/hr in sub sequent rounds its speed increases by 11km/hr in each round how much time does the car take to cover a dist of 440km a)14*8/5 b)15*14/18 c)18*4/15 d)4*15/18 e)7*4/15 Ans: C Q7. Three quarts of a bleaching chemical, minmum, contains 5% hydrogen peroxide and water. A different type of bleaching chemical, maxim, which contains 20% hydrogen peroxide, will be mixed with the three quarts of minum. How much of type maxim should be added to the 3 quarts of minum so that the resulting mixture contains 15% hydrogen peroxide? A. 3 quarts B. 3.75 quarts C. 4.5 quarts D. 6 quarts E. 9 quarts Q8. A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloeide? Ans: 6.67% 不好思意需要請各位算這麼多題因為本人數學真的很不好請各位包容謝謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.228.140.234