A z-score of 2.20 means that you scored 2.20 standard deviations above the class mean score.
Work Step by Step
A z-score measures how many standard deviations a number is above or below the mean. A positive z-score indicates that the number is above the mean, and a negative z-score indicates that it is below the mean. Since 2.20 is positive, your score is 2.20 standard deviations above the mean.