A set of data has a mean of 0. 5 and a standard deviation of 0. 1. A data point of the set has a z-score of 2. 5. What does a z-score of 2. 5 mean? The data point is 0. 01 standard deviations away from 2. 5. The data point is 0. 01 standard deviations away from 0. 5 The data point is 2. 5 standard deviations away from 0. 1. The data point is 2. 5 standard deviations away from 0. 5.