Final answer:
The three ways evenly spaced sets commonly appear on the GMAT are average, median, and range. In a symmetrical distribution, the mean, median, and mode are equal. The range provides the spread from the smallest to the largest value in the set.
Step-by-step explanation:
Three ways evenly spaced sets commonly appear on the GMAT are Average, Median, and Range, which corresponds to answer choice C. The Average is a number that represents the central tendency of the data. The Median is the best measurement to determine the center of a data set when there are outliers. The Range indicates the measure of the spread of the data, from the smallest to the largest value.
In a symmetrical distribution, the relationship among the mean, the median, and the mode is that they are all equal; this is not true in a skewed distribution. When we calculate the mean and standard deviation for the given set of data (10; 11; 15; 15; 17; 22), after using the sample formula for standard deviation, we can determine what number is two standard deviations above the mean of this data.