I was searching for average score in past CEM Bucks 11+ exams but couldn't find. I understand 100 standardized score is an average but how much is in terms of percentage?
If anyone knows then please let me know or provide me any useful link.
SD score= (% raw score + 50.9)/0.9864 has shown to be a good correlation between raw scores and the sd score in a cem test - check out vza's posts.
So sd of 100 would be around 47% raw score.
I don't think this formula is valid for all raw scores or I am doing silly mistake
E.g. if I take 100% raw score then getting SD score = 152.98053 [(100 + 50.9)/0.9864]. I believe in previous years max SD score was touching around 199 and 188 (which is not equal to 100% raw score, sure).