7y
Thank you for your review. We are sorry you were disappointed with the question asked. Whilst this is a graduate position, we are looking for candidates to demonstrate not only the key basic concepts, but that you can also apply them to a client scenario. For that reason this question would have been asked to understand your familiarity with the basics and to see that you can recognise which metrics are most appropriate in this scenario. Sometimes questions are also asked not that we expect the full correct answer, but so that the interviewers can understand your way of thinking and ability to reach a logical answer at interview.