GRE考试

根据网考网考试中心的统计分析，以下试题在2019/10/11日GRE考试习题练习中，答错率较高，为：43%
【单选题】If the average (arithmetic mean) of 10, 20, 30, 40, and x is 60, what is the value of x
A、50
B、60
C、100
D、150
E、200

网考网参考答案：E，答错率：43%
网考网试题解析：
By TACTIC El, if the average of 5 numbers is 60, their sum is 5 × 60 = 300. The 4 given numbers add up to 100 (10 + 20 + 30 + 40), so the fifth one, x, is 200 (300 -100). **Use TACTIC 1, Chapter 11. Test the choices, starting with 100. The average of 10, 20, 30, 40, and 100 is 40. That’s too small. Eliminate Choices A, B, and C, and try a larger number— 150 or 200:200 works. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>