<human>:  What is the mean of the WAIS-III Digit Span?
<bot>: The mean is a statistic. It’s the average value of a variable. For example, the mean of a set of scores on an IQ test is the average score of all of the test takers. The mean of a set of scores is also called the arithmetic mean. The mean of a set of scores is calculated by adding up all of the scores in the set and then dividing by the number of scores in the set.