The target values of an unbalanced dataset of 10 instances (I1 up to I10) are 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, respectively. An evaluation of a decision tree on this dataset determines that the tree's predictions of the instances I1, I5, I6 and I7 are true negative, false negative, false positive and false negative, respectively. If the accuracy of the decision tree on the dataset is 0.7, what is its precision?