If this can be estimated, it's going to be estimated by this sample standard deviation. Then we can say this is going to be approximately, or if we didn't get a weird, completely skewed sample, it actually might not even be approximately if we just had a really strange sample. Maybe we should write confident that. Confident that the standard deviation of our sampling distribution is going to be around, instead of using this, we can use our standard deviation of our sample, our sample standard deviation. 0.50 divided by the square root of 250, and what's that going to be? That is going to be, so we have this value right over here, actually I don't have to round it, divided by the square root of 250. We get 0.031, so this is equal to 0.031 over here.