I am not a statistics expert but I feel the statisticians are not just playing with stats they are playing with careers of students who never ever in distant dream would have thought of this butcher like normalization process to suddenly appear as a gigantic monster standing between them and a premier engineering seat of NITs/IIITs. I am still not sure what exact effects it will have on final merit list of JEE MAIN but what I have found yet is very scary. A slight less though still good say 85% in CBSE Board is even threatening someone 's rightfully seat say the person scores 250 in JEE MAIN.
85% in cbse will be roghly 90-92 percentile which when mapped to JEE MAIN distribution curve would be say 130 marks . So effective score would be like 0.6*250+0.4*0.5(130+140)=204 marks.
I am not sure now what would be his ranking which like in2012 would have been around 5-6k.
Will right more as I get myself equipped with true stats.