Phil Cook v2 wrote:

> So taking the results you've given I'm just guessing you've got a 
> low-scoring class; or the 'wrong' answer grid you're using is very 
> similar to the 'correct' one.
> 

Yes, a small, fixed number of wrong answers on the marking key would 
give the same result I suspect also.  But it is interesting to me how 
intuitively we discount the possibility that the one high score is a 
random outcome, but rather the proof that the key is okay, or mostly 
okay, and the class is low scoring.

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