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.
But the presence of outliers is likely to have a strong effect on the mean and the standard deviation, making this technique unreliable. As you can see, the extreme value at x=90 has dragged xÌ+2s, the outlier cutoff, above the point at x=52.