9/16ths of the people present are female Virtuists, and 2/16ths are male Virtuists. If you correctly calculate that 2/(9+2) of Virtuists are male, but mistakenly add 9 and 2 to get 12, you’d get one-sixth as your final answer. There might be other equivalent mistakes, but that seems the most likely to lead to the answer given.
Of course, it’s irrelevant what the actual mistake was since the idea was to see if you’ll let your biases sway you from the correct answer.
9/16ths of the people present are female Virtuists, and 2/16ths are male Virtuists. If you correctly calculate that 2/(9+2) of Virtuists are male, but mistakenly add 9 and 2 to get 12, you’d get one-sixth as your final answer. There might be other equivalent mistakes, but that seems the most likely to lead to the answer given.
Of course, it’s irrelevant what the actual mistake was since the idea was to see if you’ll let your biases sway you from the correct answer.