View your existing grades to see how approximating scores will affect your grade.
If available, your current grade is displayed in the sidebar [1]. The current grade is calculated by adding up the graded assignments according to their weight in the course grading scheme and applies when the Calculate based only on graded assignments checkbox [2] is selected in the sidebar. This checkbox is selected in the sidebar by default.
If you want to view your total grade, deselect the sidebar checkbox. Your grade will be calculated based on both graded and ungraded assignments.