Jacob Has a Bag of His Favorite Marbles

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\begin{array}{l}\begin{array} { | l | l | l | } \hline & ext { chrome } & ext { no chrome } \\hline ext { wooden } & 0.70 & 0.20 \\hline ext { not wooden } & 0.05 & 0.05 \\hline\end{array}\P ( ext { wood } \mid ext { chrome } ) = 0.70 / 0.75 = 93.3 \%\end{array}

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