A ball is drawn randomly from a jar that contains 7 red balls, 8 white balls, and 4 yellow balls. Find the probability of the given event, and show your answers rounded to 4 decimal places when...

A ball is drawn randomly from a jar that contains 7 red balls, 8 white balls, and 4 yellow balls. Find the probability of the given event, and show your answers rounded to 4 decimal places when possible.


a.  A red ball is drawn. P(red) =


b.  A white ball is drawn. P(white) =


c.  A yellow ball or red ball is drawn. P(yellow or red) =