I'm sure this is answered somewhere but I don't know the correct terms to use to search effectively.
Given: I am taking tests on which I can receive grades of A, B, or C. I have currently completed 45 tests 64% of which have a grade of A. I don't know how many test I will be given between now and a deadline of end of the semester.
I would like to know how to calculate the number of As I would have to receive in order to end with a percentage of 85% minimum - assuming that I don't receive any more Bs or Cs.
Setup the algebra:
% of A's = num of A's/num of tests -- .64=n(A)/45 n(A)=29 currently
x=0.85=(29 + e)/(45 + e) where e is the number of tests to be taken, and assuming you get an A on each. Now solve for e.
This will answer the question of "how many more tests do I need to take, if I get an A on each, to end up with a minimum of 85% A's." There might be more to the question (implied by, "I don't know how many test I will be given...").
Last edited by MrShorty; 06-16-2011 at 12:57 PM.
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