Answer
Bell-shaped.
Work Step by Step
Many students are regular and they will be in the middle of the histogram.
Few are very good students, and they will tail to the right.
Few are awful students, and they will tail to the left.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.