The analysis of shafts for a compressor is summarized by conformance to specifications. Suppose that a shaft is selected at random. What is the probability that the selected shaft conforms to surface finish requirements or to roundness requirements?

$$\begin{array}{|ccc|}\hline & & Roundness\\ & & Conforms& Does\text{}not\\ & & & Conforms\\ Surface& Conform& 345& 5\\ Finish& Does\text{}not& 1& 8\\ & Conform\\ \hline\end{array}$$