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please help me to interpret the naive bayes result in weka..

Anybody please help me to interpret the following result generated in weka for classification using naive bayes.....Please explain clearly what is this Normal Distribution , Mean , StandardDev , WeightSum and Precision.Please help me.Am new in weka.

** Naive Bayes Classifier

Class Normal: Prior probability = 0.5 

1374195_at:  Normal Distribution. Mean = 218.06 StandardDev = 6.0572 WeightSum = 3 Precision = 36.34333334
1373315_at:  Normal Distribution. Mean = 1142.58 StandardDev = 21.1589 WeightSum = 3 Precision = 126.95333339999999

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