Figure 7-2

Calculating the Percentile for a Positive z Score Drawing curves helps us to determine the appropriate percentage. For a positive z score, we add 50% to the percentage between the mean and that z score to get the total percentage below that z score, the percentile. Here, we add the 50% below the mean to the 33.65% between the mean and the z score of 0.98 to calculate the percentile, which ends up being 83.65%.