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Consider the data in the table below.

\begin{tabular}{|c|c|c|}
\hline
& Right Handed & Left Handed \\
\hline
Male & 87 & 13 \\
\hline
Female & 89 & 11 \\
\hline
\end{tabular}

What is the probability that a randomly selected person is male given the person is left-handed?

1) [tex]$\frac{13}{200}$[/tex]

2) [tex]$\frac{13}{100}$[/tex]

3) [tex]$\frac{13}{50}$[/tex]

4) [tex]$\frac{13}{24}$[/tex]


Sagot :

To find the probability that a randomly selected person is male given that the person is left handed, we need to use the concept of conditional probability. The conditional probability [tex]\(P(A|B)\)[/tex] is given by the formula:

[tex]\[ P(A|B) = \frac{P(A \cap B)}{P(B)} \][/tex]

Where:
- [tex]\(A\)[/tex] is the event that the person is male.
- [tex]\(B\)[/tex] is the event that the person is left handed.

First, let's identify the relevant counts from the table:
- Number of left handed males = 13
- Number of left handed females = 11

The total number of left-handed people is the sum of left handed males and left handed females:
[tex]\[ 13 + 11 = 24 \][/tex]

Now, the probability that a person is male given that the person is left handed can be found by dividing the number of left handed males by the total number of left handed people:
[tex]\[ P(\text{Male | Left Handed}) = \frac{\text{Number of Left Handed Males}}{\text{Total Number of Left Handed People}} = \frac{13}{24} \][/tex]

Therefore, the probability that a randomly selected person is male given that the person is left handed is:
[tex]\[ \frac{13}{24} \][/tex]

The correct answer from the options provided is:
4) [tex]\(\frac{13}{24}\)[/tex]