fixed a div by zero when there is only one element in a data set.
darcs-hash:20090529191710-ac9f3-30a829bfb777d9ae7c723c3e4edf92c58f87c18a.gz
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be843236
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darcs-hash:20090529191710-ac9f3-30a829bfb777d9ae7c723c3e4edf92c58f87c18a.gz