That in itself is a very good mathematical question, and the answer is based on how many grades you have in that class, how much points each are worth, and you grade in each of them. For example, if you had 7 A+'s and those 3 D's, and they're all the same point value, then you average it out based on the lowest possible D score and then, in a different averaging, the highest possible D score. This creates the possible percentage range you could have.
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It depends on your school's grading policy.
I don't know if anyone actually collects statistics on this, but I suspect the real answer is "considerably more than deserve a grade of C or above."Assuming the teacher grades on a (real, bell) curve and sets the grade divisions based on standard deviations (within 0.5 SD of the mean = C, 0.5 over to 1.5 over = B, more than 1.5 SDs over = A) then about 69 percent will get C or above, around 24% will get a D, and 6.7% will fail (38% will get Cs, and the percentage of Bs and As will be the same as the percentage of Ds and Fs respectively). No teacher actually does this, though.
double screen
180 10 log(x) 130 = -(117000 i integral_(-iinfinity+gamma)^(iinfinity+gamma)(Gamma(-s)^2 Gamma(1+s))/((-1+x)^s Gamma(1-s)) ds)/pi for (-1<gamma<0 and |arg(-1+x)|<pi)
V(t) = ds/dt