Remember, z-score is just how many standard deviations you are away from the mean. What is the approximate z-score that corresponds to an exam score of 5? So we really just have to figure out, this is a pretty straightforward problem, we just need to figure out how many standard deviations is 5 from the mean? You just take 5 minus 2.8. The mean is 2.8. Let me be very clear. Mean is 2.8.