Final Grade Privacy Protection for Math 207, Spring 2007

If you e-mail a request to me for your final grade, I will reply with your final exam grade and final course grade as soon as they are ready. These numbers will be hidden by a simple mathematical procedure: on your final exam paper there were two secret code numbers, which you must remember — call them A and B.

What I will e-mail you will be two other numbers:

1. The final exam grade will be a number out of 100 (the percentage correct). Note that no extra credit will be included in this -- so the maximum points for each day of the final were 100; the total points available for this exam were 200, but I will divide by 2 so the number has a maximum of 100. Call this number your final exam normalized percentage correct, P. But I will not send you that number -- to get that number, you have to add your secret code number A to the "encoded final exam percentage" that I will e-mail you. Now, if the number which results from your subtraction is more than 100, subtract 100 from that number; if the resulting number is in the range 1-100, just leave the number alone. Either way, this will then give you the P you wanted.
2. Next, I will do a similar thing with the final letter grade to be submitted for you, for this course. That is, I will take that grade, and first translate it into a number in the range 1-5, as follows:
   1. F
   2. D
   3. C
   4. B
   5. A
   But I will not e-mail you this number! I will e-mail you another number. What you must do with this "encoded final course grade" is add your secret code number B. Again, if the result is more than 5, subtract 5; if not, just leave the result alone. In either case, this number then will give you the grade, in the above-listed numerical form, which I have submitted to the registrar for you.