Sorry to drive the point home like this, but it's kind of a slow day for Macinsiders, and I've allocated myself a half hour break. :p So I'm going to make the most of it, haha.
Originally Posted by Ivan Q.
Yup that looks correct. I normally go 15 x 0.75 = 11.25, but it's the same thing =)
Technically, although rossignol is also correct, Ivan Q's way is the 'intuitive' way of thinking about it:
You take the total value of your test (say 15% of your final grade), then find out what value you've earned (by say, multiplying by 0.75, corresponding to 75%).
But of course, since real numbers are associative (ie. x(yz) = (xy)z), the two methods are equivalent:
15 x 0.75 (Ivan Q's)
=15 x (.001 x 75)
=(15 x .001) x 75 (By Associativity)
=0.15 x 75 (rossignol's)
To Afzal: Greg's method is 100% correct, but be careful of misleading grades!
Case in point: In my first year anatomy class, we had bi-weekly quizzes, labs (attendance marks) followed by one final exam (worth 60% of the term's grade), for each term.
In my first term, I attended all my labs and achieved high grades on my quizzes...calculating my grade as Greg has done, I had a 98% going into my final.
This mislead me into thinking I was well prepared for my exam...which as it turned out, I was not. Conversely, if I had used the alternative method, to find out I only had approx. 39%/40%, then I would have said "Hmm...I could still potentially fail the course."
Needless to say I learned from the experience and it hasn't steered me wrong, so I just wanted to point that out. (: