So we literally just have to calculate how many standard deviations each of these guys are from the mean, and that's their z-scores. So let me do number or part a. So we have 65. So first we can just figure out how far is 65 from the mean, let me just draw one chart here that we could use the entire time. So if this is our distribution, let's see, we have a mean of 81. So we have a mean of 81, that's our mean. And then a standard deviation of 6.3.