So you can approximate it with a normal distribution. So this is a normal distribution right over there. Now, the mean of the distribution of the proportion data that we're assuming is a normal distribution is going to be, and remember, we're working under the context that the null hypothesis is true. So this mean is going to be this mean right here. So the mean of our sample proportions is going to be the same thing as our population mean. So this is going to be 0.3, same value as that. And the standard deviation, this comes straight from the central limit theorem.