Well, it is five liters above the mean. So let me write this down. So the z here, the z is equal to 25 minus the mean, minus 20, divided by the standard deviation for, I guess you could say, this combined normal distribution. This is two standard deviations above the mean, or a z-score of plus two. So if we look at a z-table, and we look exactly two standard deviations above the mean, that will give us this area, the cumulative area below two standard deviations above the mean. And then if we subtract that from one, we will get the area that we care about. So let's get our z-table out.