Originally Posted by Unregistered

I don't think so. From statistic point of view, while Expected msg stated is an absolute decimal, the generation of this expected msg from psle score or grade is at best an approximation and definitely will have its uncertainty.

There is bound to have uncertainty. If say your class avg expected msg is 3.1, and actual is 3.3. I don't think you will be faulted. As it may not be significantly different from the expected. Which the expectations was built on equations that may have error. But say your actual is 4.5 and expected is 3.1. your colleagues classes are also having expected 3.1 but they get actual 2.9 then maybe something is wrong.

But a consistent underperformance below expected across time and space *(different batches and classes) may be significant.