That's the average of all of your weekly quizzes in the recitation. Each of those three monthly tests gives also a sixth.

就是你们每周背诵课的测试的平均分,而三次的月考,的成绩也占六分之一。

麻省理工公开课 - 固态化学导论课程节选

All of those slave societies had a population of slaves that was from one-quarter to one-half, and sometimes more, of the total population.

这些奴隶社会的奴隶人口都占总人口,的三分之一到一半,有时甚至更多

耶鲁公开课 - 美国内战与重建课程节选