Table I: Area under the Normal Density Function

To use the table, identify the value of for which you want to find . The table is structured with values in increments of 0.1 along the rows and 0.01 along the columns. For example, to find , locate the row for 1.2 and the column for 0.05. The intersection of this row and column provides the cumulative probability value, which represents .

For negative values of , the table can still be used by leveraging the symmetry: