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. So the standard deviation of our sample proportions is going to be the square root. It's going to be our population standard deviation. The standard deviation we're assuming with our null hypothesis divided by the square root of the number of samples we have.