Collaboration in Cambridge MBA

Quite often, the Cambridge MBA is referred to its "Collaborative" culture. But in reality, how much "collaboration" is counted in assessment?

First of all, I just split assessment of assignments in each course into "Group" or "Individual". Through calculating the average weighted by credit,  I have found that 40% of the Michaelmas assessment and more than half, or 53% depending on electives you take, of the Lent were related to "Group".

The implication: around half of your marks are dependent on your group, which is more or less uncontrollable as randomly assigned by the Programme Office. It is obvious that the Cambridge MBA with Distinction can be partially dependant on your luck.