The Following Table Shows the Results of a Survey of 420

question 229

Essay

The following table shows the results of a survey of 420 authors by a (fictitious) publishing company: $$\begin{array} { | l | l | l | l | } \hline & \begin{array} { l } \text { New } \\\text { Authors }\end{array} & \begin{array} { l } \text { Established } \\\text { Authors }\end{array} & \text { Total } \\\hline \text { Successful } & 90 & 10 & 100 \\\hline \text { Unsuccessful } & 150 & 170 & 320 \\\hline \text { Total } & 240 & 180 & 420 \\\hline\end{array}$$ ​
A successful author is chosen at random.
Compute the estimated probability of the event that the successful author is established.

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Definitions:

Igneous Rock

Rock formed through the cooling and solidification of magma or lava, categorized into intrusive or extrusive depending on the environment of formation.

Sierra Nevada

A mountain range in the Western United States, known for its dramatic landscapes, including Yosemite Valley and Lake Tahoe.

Granitic Rocks

Igneous rocks primarily composed of quartz, feldspar, and mica, known for their coarse-grained texture.

Metamorphism

A geological process where rocks undergo physical and chemical changes due to extreme heat and pressure, forming new types of rocks.