Why?
Let’s look at your table of shoes after a few weeks in business.

When we had the same number of all the sizes – we did not pay attention to the fact that there aren’t equal numbers of feet at each shoe size.

When the store stocked the same number of shoes for all sizes, this did not take into account the fact that there aren’t equal numbers of feet at each shoe size. Let’s look again at the pattern of shoe purchases for an idea of how shoe size is distributed in the population.

It seems that shoe size is normally distributed. What else do you need to know to place a better shoe order for the store?

1. The typical Score - Central Tendency
2. How are the scores spread out - Variability