Is there mathematical proof of a grassy knoll shooter?

Richard Charnin, a software consultant, says yes. He made the case on his blog last week. His argument is reprinted here:
Charnin writes:
Of 121 eyewitnesses, 51 (42%) said shots came from the Grassy Knoll area, 32 from the Texas School Book Depository (TSBD), and 38 had no opinion.
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