Red and yellow creates orange. Yellow and blue creates green. The secondary colors can be mixed further to create additional shades. Tertiary colors are the result of a primary and secondary color mixed together. For example, orange mixed with red creates red-orange.
An influential point is an outlier that greatly affects the slope of the regression line. One way to test the influence of an outlier is to compute the regression equation with and without the outlier. This type of analysis is illustrated below.
Outliers affect the moments drastically and the higher the moment the more it's affected. Consider the following little dataset: {1, 2, 3, 4, 100}. The median is 3. Quantile based measures of dispersion will be gentle until you have to start dealing with the 100. The mean is 21.