The term 'Bell Curve Figure' refers to the statistical concept of the normal distribution, which is also known as the Gaussian distribution. The normal distribution is a symmetrical bell-shaped curve that is defined by its MEAN, or average, value. The MEAN is the most common measure of central tendency in a set of data and is calculated by adding up all the values in the data set and dividing by the number of values. In the context of the crossword puzzle, the answer to the clue 'MEAN (4 letters)' is 'AVER'.