Let’s consider an example to find the z score value and corresponding probability. If the z score value is negative, use the negative z table to find an area on the left of the mean of the distribution. If the z score value is positive, use the positive z table to find the area on the right of the mean of the distribution. Once you have the z score value, the next step is to select the z table either the positive z table or the negative z table.
Σ = is the standard deviation of the population You can refer Z score calculator article which explains how to calculate Z score using the z score formula as below To use the Z table, you should have a Z score value. Z table is used to find z score value lies on the left of the mean or right of the mean distribution. Z Score Table Negative or Z Score Chart Negative How to read Z Table
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