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Cumulative standard deviation: Difference between revisions
→{{header|Python}}
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===Python: In a couple of 'functional' lines===
<lang python>>>> myMean = lambda list : reduce(lambda x, y: x + y, l) / float(len(l))
>>> myStd = lambda list : reduce(lambda x,y : x + y , map(lambda x: (x-myMean(l))**2 , l)) / float(len(l))
>>> myList = [2,4,4,4,5,5,7,9]
>>> print myStd(MyList)
=={{header|R}}==
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