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Most student groups, either high-performance (A) or low-performance (B), were composed of a mixture of high-, mid-, and low-scoring members and classified as heterogeneous (top row), 57/65 total groups. A much smaller number of groups (8/57) were homogeneous (bottom row) and were composed of either all high- (three groups), all mid- (one group), or all low-scoring students (four groups).
