GRE考试

【单选题】

Camille’s average on her 6 math tests this marking period is 75. Fortunately forCamille, her teacher drops each student’s lowest grade, and this raises her average to 85. What was her lowest gradeA、20

B、
B、25
C、30
D、40
E、50

网考网参考答案：B
网考网解析：
On six tests combined, Camille earned a total of 6 × 75 = 450 points [TACTIC El]. The total of her five best grades is 5 × 85 = 425 points, so her lowest grade was 450 -425 = 25. **Assume that Camille’s five best grades were each 85. Then each one has a deviation of 10 points above the average of 75, and the total deviation above 75 is 5 × 10 = 50 points. Therefore, her one bad grade must have been 50 points below 75. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>