How'm I Doin'?

It can be difficult for a caveman to gauge his progress in the course, given that many will put off passing projects until after Thanksgiving. This pattern is partly due to the time required to complete some projects. But most people who get poor grades in Caveman Chemistry do so because they waited too long to get started. To help you pace yourself, here is the grade history for Caveman 1998:

Final GradeFDD+C-CC+B-BB+A-A
Number of Students214501435010
Avg # Projects Passed
by Sept 300000-1011-2
by Oct 310110-1033-7
by Nov 300113-4567-12
by Dec 82678-10111213-15

Notice that students who earned an A had completed most of their projects by Nov 30. On average, students were able to pass six or fewer projects in December, so the number passed by Nov 30 was crucial to their final grades. The GPA for this class was 2.67 with a standard deviation of 1.21.