Let us look at an example. If you look at the chart for the normal distribution the Z scores are in the first column and first row. The first column has Z score of #.#. The first row has Z scores of 0.0. Again, the first column and first row are the Z scores. All of the other values in the table are the probabilities of getting the Z score.If we are looking for the probability of a Z of 1.25 we would go to the first column to find 1.2 and the first row to find .05. the value in the table that corresponds to this Z score is .3944.

Let us try another example. What is the probability of a Z score of 1.64?