The Following Table Shows the Results of a Survey of 380

The following table shows the results of a survey of 380 authors by a (fictitious) publishing company:
$$\begin{array} { | l | l | l | l | } \hline & \begin{array} { l } \text { New } \\\text { Authors }\end{array} & \begin{array} { l } \text { Established } \\\text { Authors }\end{array} & \text { Total } \\\hline \text { Successful } & 80 & 20 & 100 \\\hline \text { Unsuccessful } & 120 & 160 & 280 \\\hline \text { Total } & 200 & 180 & 380 \\\hline\end{array}$$ ​
An established author is chosen at random.
Compute the estimated probability of the event that the established author is successful.