Skew

Skewness can be defined as the extent to which a distribution differs from a normal distribution. In a normal distribution, the graph appears symmetrical, “bell-shaped curve”, with no skew. The mean, mode and maximum point on the curve are equal.

A left-skewed distribution is also called a negatively skewed distribution and has a long left tail. In this case, the mean is less than the mode.

A right-skewed distribution is also called a positively skewed distribution and has a long right tail. In this, the mean is more than the mode.