Qualification > Math
S1 and S2 DOUBTS HERE!!!!
mdwael:
okay I have something which I want to make clear of. When you code data.. Product moment correlation is not affected, Variance and standard deviation are only affected when you multiply and divide and Mean is affected by everything. Am I right?
xMilishax:
Can someone please explain Q7(a) in Jan 2011 S1 paper?
Thanks. :)
xMilishax:
I got it. LOL :P
Master_Key:
CIE
9709_s10_qp_62
Q 7 (ii).
I just want to know any short method, i have got the answer but with a way too long method.
Ghost Of Highbury:
--- Quote from: Master_Key on May 24, 2011, 02:04:19 pm ---CIE
9709_s10_qp_62
Q 7 (ii).
I just want to know any short method, i have got the answer but with a way too long method.
--- End quote ---
as the markscheme suggests, its simple.
The no. of ways the pink card is not next to the green card = Total no. of ways - (the no. of ways the green card and the pink are together)
The no. of ways the pink and green are together...
There is a very neat trick to find this, it's in there in the CIE S1 book
U consider the 2 cards as a unit, and permute them with the other 7
Like this [pink, green] + 7 others... = total 8 (regarding the pink, green as one unit)
The permutation = 2*8!
Subtract this from 9! and u have ur answer
9!-(2*8!)
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