Extreme platykurtic a negative value greater than -1.00. A positive value indicates that the cases are clustered more to the left of the mean with most of the extreme values to the right. A negative value indicates clustering to the right. A distribution can't be described fully only by a measure of central tendency. An index of dispersion is also needed.
Variability is a description of the tails of our curve - that is of the spread of scores.
25 Mean is the same on both, but very different distributions. So range can be helpful, but is the most unstable measure of variability there is. Because only affected by 2 scores. There are other types of ranges used. To understand them, you must understand percentiles, quartiles, and deciles.