Those are the Exam marks - BOSTES aligns the raw marks to set those cut offs (the way they do so is not released to the public), so e.g a raw mark of 70 may be aligned to a 90 exam mark, which is an E4.I don't really get how the bands work for 4u is it the same as other subjects like 90 is band 6/e4, 80 is band 5/e3 and 70 is band4/e2?
I'd say around 98+ (assuming one is first internally). Not sure if the cut off has ever gone below 98 for post 2012 exams. The exam this year was mainly to distinguish between people who are in low to mid E4 level, but for the top students, it was an absolute gift, because there was no question to distinguish them. This is of course, just my opinion. It will be great if some of the older, more experienced members here could have a say in this?
I think you'd need to justify your second line. Whilst it is true for all non-negative x (well, put ≥ signs), the reasoning is different based on whether x is bigger than 1 or smaller than 1.for the inequalities, is this an appropriate proof?
x*x^1/2 -x^1/2 >x-1
then rearranging gives
x*x^1/2 +1 >x^1/2 + x
How many marks would i get for Q15 c p(ii).
I basically argued that the value of numerator follows the nth row of pascals triangle with interchanging signs of negative and positive depending on the value of k. I claimed this as observation from part (i). And hence the ak should be nCk (-1)^k
Hopefully maybe 1 mark?