This is the population mean. And maybe I should write it this way. The mean assuming our null hypothesis is 0.3. And then the population standard deviation, let me write this over here in yellow. The population standard deviation, assuming our null hypothesis, and we've seen this when we first learned about Bernoulli distributions. It is going to be the square root of the percentage of the population that has internet access, so 0.3, times the proportion of the population that does not have internet access, times 0.7 right over here. So this would be the square root of 0.21.