1. Central Tendency
Central Tendency – measures of location for a distribution
Mode – the commonly occurring number in a data set
Median – the middle score in a distribution
Mean – the average score

2. Visual Representation of the Mean
The numerical distance of scores below the mean is always equal to the numerical distance of scores above the mean

3. Skew and Central Tendency
For a normal distribution, all measures of central tendency are equal
For a skewed distribution, the measures of central tendency are different