The following table shows the results of a survey of 390 authors by a (fictitious) publishing company: $$\begin{array} { | l | l | l | l | }
\hline & \begin{array} { l }
\text { New } \
\text { Authors }
\end{array} & \begin{array} { l }
\text { Established } \
\text { Authors }
\end{array} & \text { Total } \
\hline \text { Successful } & 80 & 40 & 120 \
\hline \text { Unsuccessful } & 100 & 170 & 270 \
\hline \text { Total } & 180 & 210 & 390 \
\hline
\end{array}$$
An unsuccessful author is chosen at random.
Compute the estimated probability of the event that the unsuccessful author is established.

Question

The following table shows the results of a survey of 390 authors by a (fictitious) publishing company: $$\begin{array} { | l | l | l | l | } 
\hline & \begin{array} { l } 
\text { New } \
\text { Authors }
\end{array} & \begin{array} { l } 
\text { Established } \
\text { Authors }
\end{array} & \text { Total } \
\hline \text { Successful } & 80 & 40 & 120 \
\hline \text { Unsuccessful } & 100 & 170 & 270 \
\hline \text { Total } & 180 & 210 & 390 \
\hline
\end{array}$$ ​
An unsuccessful author is chosen at random.
Compute the estimated probability of the event that the unsuccessful author is established.

Quizplus · Accepted Answer

The Answer of The following table shows the results of a survey of 390 authors by a (fictitious) publishing company: $$\begin{array} { | l | l | l | l | } 
\hline & \begin{array} { l } 
\text { New } \
\text { Authors }
\end{array} & \begin{array} { l } 
\text { Established } \
\text { Authors }
\end{array} & \text { Total } \
\hline \text { Successful } & 80 & 40 & 120 \
\hline \text { Unsuccessful } & 100 & 170 & 270 \
\hline \text { Total } & 180 & 210 & 390 \
\hline
\end{array}$$ ​
An unsuccessful author is chosen at random.
Compute the estimated probability of the event that the unsuccessful author is established.

The Following Table Shows the Results of a Survey of 390