Mark:
     Hello, you pose an interesting observation and question.  The first thing which comes to mind is that predictions based on statistics are more likely to fall within predicted ranges when relatively high numbers are involved.  I don't recall off-hand how many of each (lunar and Martian) meteorites there are, but the numbers are fairly small.  If we flip a coin all day we should come out to something approaching 50/50 heads to tails.  But within those results there may be strings of 10 tails and 2 heads, or 25 heads and 13 tails etc.  When you throw other factors into the mix, some of which you mentioned, I don't think we'll have an accurate assessment until many more specimens are collected.
 
George 

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