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:
\begin{tabular}{ccc}
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
\end{tabular}
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?