if i have a 97 in my class but i completely fail my fonal with a zero, how many points will i lose on my class average

Question

• My final is worth 20% of my grade

Answer 1

An overall (weighted) average is just as though you got the same score the amount of times that the weight indicates.

 

In great detail, this is (97+97+97+97+...97+0+0+0...+0)/100                       80 97's and 20 0's

  It's a little simpler to compute (80*97 + 20*0)/100 = 77.6

 

     Note that this is also:

          (.8)*97 + (.2)*0 = 77.6

   So you could think of this situation as getting 7760 points (80*97) out of a possible 10,000 (a 100 100's)

          (80)*97 + (20)*0 = 7760