df t 0.100 t 0.050 t 0.025 t 0.010 t 0.005 1 3.0777 6.3138 12.7062 31.8205 63.6567 2 1.8856 2.9200 4.3027 6.9646 9.9248 Normal distributions are symmetrical, bell-shaped distributions that are useful in describing real-world data. t DISTRIBUTION TABLE Entries provide the solution to Pr(t > tp) = p where t has a t distribution with the indicated degrees of freeom. This is the "bell-shaped" curve of the Standard Normal Distribution. Standard Normal Distribution Table. The standard normal distribution, represented by the letter Z, is the normal distribution having a mean of 0 and a standard deviation of 1. It is a Normal Distribution with mean 0 and standard deviation 1. The full normal distribution table, with precision up to 5 decimal point for probability values (including those for negative values), can be found here. STANDARD NORMAL DISTRIBUTION: Table Values Represent AREA to the LEFT of the Z score. Let’s see some real life examples.