Hi, just guessing here. But numarray seems to calculate the result in a bigger dataype, while numpy uses float32 which is the input arrays size (at least I thought so, trying it confused me right now ...). In any case, maybe the difference will be gone if you use .mean(dtype='float64') (or whatever dtype numarray actually uses, which seems to be "numarray.MaximumType(a.type())" where a is the array to take the mean).
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