dp624 said:
Y gets 92 external and ~90 internal
X gets 71 external and 92 internal
Dragonmaster262 said:
How does Y get 90? Shouldn't he get 71?
Y gets 90 because the moderating process takes into account the relative differences between students in addition to the rank order. The procedure for classes of two students also differs slightly to the general procedure.
As there is a difference of only two marks between the raw internal scores but a difference of 21 marks between the external scores, the minimum external score is deemed to be too low to stand as a moderated mark.
In these circumstances the moderated mark is calculated as follows:
moderated mark = ( lowest internal / highest internal ) * highest external
You can see that the effect of this is to ensure that the ratio of minimum to maximum marks is maintained between the internal and external assessments.
Of course, if Y's external performance had not been so low and Y had performed at a level warranting a higher moderated mark, that higher mark would have been used instead.