Given the data in the table below, one wants to classify the records' "Return" to be "Up" or "Down" based on other attributes. If the attribute "Past Trend" is used for split - there are two nodes from this split: "Positive" and "Negative", what is the gini index of the node "Positive"? Past Trend Open Interest Trading Volume Return Positive Low High Up Negative High Low Down Positive Low High Up Positive High High Up Negative Low High Down Positive Low Low Down Negative High High Down Negative Low High Down Positive Low Low Down Positive High High Up