6.99 A theater complex is currently showing four R-rated movies, three PG-13 movies, two PG movies, and one G movie. The following table gives the number of people at the first showing of each movie on a certain Saturday:

Theater Rating Number of Viewers 1 R 600 2 PG-13 420 3 PG-13 323 4 R 196 5 G 254 6 PG 179 7 PG-13 114 8 R 205 9 R 139 10 PG 87 Suppose that one of these people is randomly selected.

a. What is the probability that the selected individual saw a PG movie?

b. What is the probability that the selected individual saw a PG or a PG-13 movie?

c. What is the probability that the selected individual did not see an R movie?