A. Statistics are often used to describe and interpret the results of intelligence testing. Describe three measures of central tendency (mean, median, and mode). Describe a skewed distribution. Relate the three measures of central tendency to a normal distribution. Relate the three measures of central tendency to a positively skewed distribution. An intelligence test for which the scores are normally distributed has a mean of 100 and a standard deviation of 15. Use this information to describe how the scores are distributed.