In a class with both graduate and undergraduate students, is it normal for a single grading curve to be applied for both groups? I took a class with graduate students as an undergraduate student. The grading was on a curve and combined (as in graduate students were graded along with undergraduate students).

Is this normal in US universities as well? Won't the undergraduate students have a disadvantage competing against graduate students (pursuing 2nd year of Masters/PhD) for a good grade.

What ended up was:

1 A Grade

12 B Grades (7 of which went to graduate Students and 5 to undergraduate students)

20 C Grades

10 D Grades

3 E Grades

For a class of 25 graduate students and 21 undergraduate students.
In the past, I've graded the pool together, and have also graded grads and undergrads separately. Ultimately this is a decision made by the instructor, who probably spelt this out in their syllabus before the class started.