>>3
Yes.
>>4
C is also there, with a score of 40. That's only 5 less than the Scheme score.
>>2
It is not only biased, but some of the sh solutions cheat. In "system" it does not actually call any external program, in "sed" it calls and external C program instead of implementing it in (ba)sh, same with "grep".
For Scheme they target Guile 1.4. You can target your favourite implementation. These are basically codegolf and I was interested in seeing what the wizards here would come up with.