csat-suneung 2010 Q7

csat-suneung · South-Korea · csat__math-humanities 3 marks Conditional Probability Bayes' Theorem with Production/Source Identification

10\% of the emails Cheol-su receives contain the word ``travel.'' 50\% of emails containing ``travel'' are advertisements, and 20\% of emails not containing ``travel'' are advertisements. Given that an email Cheol-su received is an advertisement, what is the probability that this email contains the word ``travel''? [3 points]
(1) $\frac { 5 } { 23 }$
(2) $\frac { 6 } { 23 }$
(3) $\frac { 7 } { 23 }$
(4) $\frac { 8 } { 23 }$
(5) $\frac { 9 } { 23 }$

10\% of the emails Cheol-su receives contain the word ``travel.'' 50\% of emails containing ``travel'' are advertisements, and 20\% of emails not containing ``travel'' are advertisements. Given that an email Cheol-su received is an advertisement, what is the probability that this email contains the word ``travel''? [3 points]\\
(1) $\frac { 5 } { 23 }$\\
(2) $\frac { 6 } { 23 }$\\
(3) $\frac { 7 } { 23 }$\\
(4) $\frac { 8 } { 23 }$\\
(5) $\frac { 9 } { 23 }$

Paper Questions

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