shaggybill

Full Member
15+ Year Member
Jul 8, 2004
704
190
Admittedly, with this being my first semester at a school that curves its science classes, I know nothing about curves. If out of 1200 students the class average is in the mid 60's, is it possible to predict where a A will fall?
 
About the Ads

Chemdude

Full Member
10+ Year Member
Oct 8, 2008
1,652
165
Status (Visible)
  1. Resident [Any Field]
Yes,

Take the function f(x)=
section05_eq04.gif
and normalize. Normalize so that the average occurs at the maximum and the top %10 recieve A's. It should be 88%+
 

DrYoda

Space Cowboy
10+ Year Member
Jun 22, 2008
13,815
129
Dagobah System
Status (Visible)
  1. Attending Physician
It seems when curving profs like to aim for an average of 70%. But it really comes down to the prof and how he feels like curving, so you can't really predict.
 

Premed Worrier

Full Member
10+ Year Member
5+ Year Member
Apr 12, 2008
540
0
North Carolina
Status (Visible)
  1. Medical Student
Admittedly, with this being my first semester at a school that curves its science classes, I know nothing about curves. If out of 1200 students the class average is in the mid 60's, is it possible to predict where a A will fall?

Damn, I thought my classes of over a hundred were big...1200?
 

StPlayrXtreme

Full Member
10+ Year Member
5+ Year Member
Aug 6, 2008
149
0
Status (Visible)
It depends on the standard deviation...so really no way to tell unless they tell you the SD. And even then it's up for the professor to set the letter grade at the mean.

Some professors "aim" for a certain mean grade...others just take care of it in the end.
 

chemnerd89

In it for the lulz
10+ Year Member
5+ Year Member
Jun 23, 2008
736
5
Status (Visible)
  1. Medical Student
Hey, now all you have to do is teach just about everyone on this forum how to normalize functions, and you've answered the question. :p

I normalize wave functions with the best of them. ;)
 

AdmiralChz

Full Member
10+ Year Member
Sep 8, 2008
3,774
3,731
Mid-Atlantic
Status (Visible)
  1. Attending Physician
85-90 will be the bottom or an A-, depending on the grading system. Then again, I once had a class where an A+ was a 90, so it just depends.

Yeah, depends on how tightly packed in everyone is (see: standard deviation). If 60% of the class is between 50-70, then don't be surprised if an 80 (or even lower) would be an A. If it's more spread out (i.e. 40-80) then an A will be higher.

And I thought my 500 person Chem class was big...
 

Chemdude

Full Member
10+ Year Member
Oct 8, 2008
1,652
165
Status (Visible)
  1. Resident [Any Field]
I figured that might be a common thought. :laugh: Not everyone has had upper-level math courses.

ahhhh, how refreshing...Probabilty and Statistics, the two most important/applicable topics of mathematics....how can me live without them.
 

silverlining1

Full Member
10+ Year Member
7+ Year Member
Oct 10, 2006
1,810
3
California
Status (Visible)
  1. Medical Student
I'll chime in with "it depends". I had classes where the mean was curved to a B- and classes where it was curved to a B+. So... we don't have an answer for you.
 

ChubbyChaser

Yummmy
10+ Year Member
Apr 14, 2007
13,168
7
Status (Visible)
  1. Medical Student
Mid 60s for a gen chem class....id say it should probably be rougly a 10-12 pt scale.
 

gridiron227

Full Member
10+ Year Member
Oct 20, 2008
37
0
Status (Visible)
  1. Pre-Medical
My quick and dirty method:

Assuming the prof curves to a B (not always the case, of course, depending on how satisfied he is with the average), one standard deviation above the mean will probably be pretty close to the B+/A- cutoff. Judge based on that where the rest of the scale will fall... or just ask your TA to give you some better grading guidelines.
 
1

135892

You should just ask the TA... I'm sure they'll have at least some idea of how the prof likes to grade the class
 
About the Ads
This thread is more than 12 years old.

Your message may be considered spam for the following reasons:

  1. Your new thread title is very short, and likely is unhelpful.
  2. Your reply is very short and likely does not add anything to the thread.
  3. Your reply is very long and likely does not add anything to the thread.
  4. It is very likely that it does not need any further discussion and thus bumping it serves no purpose.
  5. Your message is mostly quotes or spoilers.
  6. Your reply has occurred very quickly after a previous reply and likely does not add anything to the thread.
  7. This thread is locked.