It's a real distribution with a real mean. Its mean, it has a pure mean. Its mean, so the mean of the sampling distribution of the sample mean, we'll write it like that. Notice I didn't write it as just the X. What this is, this is actually saying that this is a real population mean. This is a real random variable mean. If you looked at every possibility of all of the samples that you can take from your original distribution, from some other random original distribution, and you took all of the possibilities of, let's say sample size, let's say we're dealing with a world where our sample size is 10.