# What is a skewed histogram

That is, data that have a lower bound are often skewed right while data that have an upper bound are often skewed left. It is perfectly symmetrical. The tail is the part where the counts in the histogram become smaller.

## Skewed Data

The mean is less than the median. For symmetric distributions, the mean is approximately equal to the median. For a symmetric distribution, the left and right tails are equally balanced, meaning that they have about the same length. Income Distribution Here is some data extracted from a recent Census. Since these differences are so small and since they contradict each other, we conclude that the data set is symmetric.

What is Skewness?

Normal Distribution Data Index. A histogram is a graph that organizes and displays numerical data in picture form, showing groups of data and the number or percentage of the data that fall into each group. The few smaller values bring the mean down, and again the median is minimally affected if at all.

For a skewed distribution, however, there is no "center" in the usual sense of the word. A random distribution, as shown below, has no apparent pattern. Time to occurence and size are common measurements that cannot be less than zero.