REPTree regression tree: meaning of leaf node information

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REPTree regression tree: meaning of leaf node information

zbicyclist
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In my regression tree, the leaf nodes have a variety of information, e.g. this leaf node:

Age_08_04 < 32.5
|   Weight < 1297.5
|   |   HP < 104
|   |   |   Age_08_04 < 19.5
|   |   |   |   Fuel_Type2 = notPetrol : 21358 (4/750000) [1/20611600]

(This is a data set containing the values of used Toyota Corollas in the Netherlands.)

The 21358 number is the predicted value of the used car.  
But what are the other two pairs of numbers?

(I searched on this, but the answer I found referred me to broken links.)
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