what is the probablity that the next item purchased is frappuccino or a pastry?

Question

based on the past sales the probablity that the next item purchased will be a frappuccino is 0.55 additionally the probablity that the next item purchased is a pastry is 0.35 what is the probablity that the next item purchased is frappuccino or a pastry?

Answer 1

This is a union because the next item could be either, and thus all you would need to do is add the two individual probabilities together. 

 

.55 + .35 = .9