Well, this is going to be equal to, let's see, our sample mean is four minus our assumed mean is five, our assumed population mean is five. Our sample standard deviation is two. All of that over the square root of the sample size, all of that over the square root of 25. So this is going to be equal, our numerator is negative one. So it's negative one divided by two over five, which is equal to negative one times five over two. And so this is going to be equal to, equal to negative five over two, or negative 2.5. And then what we would do in this, what Rory would do, is then look this t-value up on a t-table and say, so if you look at a distribution of a t-statistic, something like that, and say, okay, we are negative 2.5 below the mean.