The Following Table Shows the Results of a Survey of Authors

The following table shows the results of a survey of authors by a (fictitious) publishing company: $\begin{array}{|l|l|l|l|}\hline & \text { New Authors } & \begin{array}{l}\text { Established } \\\text { Authors }\end{array} & \text { Total } \\\hline \text { Successful } & 5 & 25 & 30 \\\hline \text { Unsuccessful } & 15 & 55 & 70 \\\hline \text { Total } & 20 & 80 & 100 \\\hline\end{array}$
Consider the following events:
S: An author is successful; U: An author is unsuccessful; N: An author is new; and E: An author is established.
Are the events N and S mutually exclusive