What is the population of Qasemabad-e Aqa?
The population of Qasemabad-e Aqa is 918.
Because a certain percentage of people (i.e. the top 5% or so) need to be kept at an A* percentile, then the next 10% or so of the population at an A. Basically, it is to keep the grading system fair and in balance, they don't want too many people on A*, but equally, they will raise the boundary if lots of people score low. It simply depends on how hard the test is.