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Kovid Goyal 2009-01-03 00:18:13 -08:00
parent b32c97ea04
commit cabb094390
1 changed files with 2 additions and 0 deletions
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src/calibre/trac/donations/server.py
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@ -102,6 +102,8 @@ class Stats:
def get_deviation(self, amounts):
l = float(len(amounts))
if l == 0:
return 0
mean = sum(amounts)/l
return sqrt( sum([i**2 for i in amounts])/l - mean**2 )