Relative importance given to these different things, there's 20% for your homework, 30% for the Midterm, which will be sometime in October, and 50% for the Final.

这门课的成绩会由以下几部分构成,平时作业占20%,期中考试占30%,期中有时在10月份考,期末考试占50%

耶鲁公开课 - 基础物理课程节选