A z score table is a mathematical table that is used to display the percentage of values that fall below a particular z score. There can be two types of z score tables - positive and negative. The z table gives the area under a standard normal distribution curve to the left of the z score. There are two z-score tables which are: Positive Z-score Table: Used when the Z-score is positive and above the mean. A positive Z-score table allows you to find the percentage or probability of all values occurring below a given positive Z-score in a standard normal distribution. Use this z table, also referred as z score table, standard normal distribution table and z value chart, to find a z score. If you are not sure how to look up z score probabilities in the z tables, you will find easy to use z score probability calculator (to find right and left tail probabilities) and a z score calculator (to calculate a z score Z tables are typically composed as follows: The label for rows contains the integer part and the first decimal place of Z. The label for columns contains the second decimal place of Z. The values within the table are the probabilities corresponding to the table type. A positive z-value indicates that the point lies to the right of the mean, and a negative z-value indicates that the point lies left of the mean. There are a few different types of z-tables. The values in the table below represent the area between z = 0 and the given z-score. To use the z-score table, start on the left side of the table and go down to 1.2. At the top of the table, go to 0.05. This corresponds to the value of 1.2 + .05 = 1.25. The value in the table is .8944 which is the probability. Roughly 89.44 percent of people scored worse than Zoe on the ACT. Use a z-table to find probabilities corresponding to ranges of z-scores and to find p-values for z-tests. The z-table is divided into two sections, negative and positive z-scores. Negative z-scores are below the mean, while positive z-scores are above the mean. How to Read The Z Table. To map a Z score across a Z Table, it goes without saying that the first thing you need is the Z Score itself. In the above example, we derive that Eric's Z-score is 0.56. Once you have the Z Score, the next step is choosing between the two tables. The z score table helps to know the percentage of values below (to the left) a z-score in a standard normal distribution. Q2 What are the Types of Z Score Table? There are two z-score tables which are: Positive Z Score Table: It means that the observed value is above the mean of total values. Step 1: Find the z-score. First, we will find the z-score associated with a height of 26 inches. z-score = (x - μ) / σ = (26 - 26.5) / 2.5 = -0.5 / 2.5 = -0.2. Step 2: Use the z-table to find the percentage that corresponds to the z-score. Next, we will look up the value -0.2 in the z-table: RXE7.