2. 外语
  3. When the average of a list of course grades is multiplied by the number of courses, the result is n. What does n represent?

When the average of a list of course grades is multiplied by the number of courses, the result is n. What does n represent?

admin2013-05-19  36
问题 When the average of a list of course grades is multiplied by the number of courses, the result is n. What does n represent?
选项 A、Half the number of courses
B、Half the sum of course grades
C、The number of courses
D、The average of the course grades
E、The sum of the course grades
答案E
解析 The correct answer is E. You are given that the product of the average of a list of course grades and the total number of courses is n. Recall that average, A, is equal to the sum of the course grades, G, divided by the number of courses, C; thus A = G/C. Because n is the product of the number of courses, C, and the average of the course grades, A, n=AC. Further, because A = G/C, multiplying both sides by C yields G=AC. Finally because n=AC and G=AC, it follows that n = G. Thus n is the sum of the course grades.
转载请注明原文地址:https://kaotiyun.com/show/pAkO777K
本试题收录于： GRE QUANTITATIVE题库GRE分类
0

GRE QUANTITATIVE

GRE

相关试题推荐
随机试题
最新回复(0)