So how do we figure that out? Well the first thing, let's just make sure we incorporate the 95% confidence level. So we could look at a z-table. Remember, 95% confidence level, that means if we have a normal distribution here, if we have a normal distribution here, 95% confidence level means the number of standard deviations we need to go above and beyond this in order to capture 95% of the area right over here. So this would be 2.5% that is unshaded at the top right over there, and then this would be 2.5% right over here. And we could look up in a z-table, and if you were to look up in a z-table, you would not look up 95%. You would look up the percentage that would leave 2.5% unshaded at the top.