The Judd website can be a little confusing as it says that 140 is the [/i]most common [/i]individual score in Kent, not the average score. It only means that more children scored 140 than 129,114,106 or any other individual score.If you look at the NFER website, you can see why this happens
http://www.nfer.co.uk/research-areas/as ... sation.cfm
All the individual scores in Kent produce a bell curve like the one on the NFER site, with 100 as the average score. The reason there are more individual 140 scores than 100 scores is that, due to the statistical process, 140 scorers also includes all those who would have scored more than 140 but cannot be measured in this test i.e all the children in the part of the bell curve to the right of 140(unfortunately not shown in the diagram)
420 is 140/paper, approx. 75% raw score on each paper. The pass mark for the last two years has been 120,120,115 in any order, with slightly higher passmarks in previous years. However, pass mark and standardisation depend on the ability of the particular cohort taking the test, so change from year to year.
Hope this helps