They tell us that the mean is 150 centimeters. So let me draw that. So the mean, that is 150. And they also say that we have a standard deviation of 20 centimeters. So 20 centimeters above the mean, one standard deviation above the mean is 170. One standard deviation below the mean is 130. And we want the probability of, if we randomly select from these middle school students, what's the probability that the height is greater than 170?