In a class of students, the following data table summarizes how many students play an instrument or a sport. What is the probability that a student chosen randomly from the class plays neither a sport nor an instrument?

\begin{tabular}{|c|c|c|}
\hline
& \begin{tabular}{c}
Plays an \\
instrument
\end{tabular} & \begin{tabular}{c}
Does not play \\
an instrument
\end{tabular} \\
\hline
\begin{tabular}{c}
Plays a \\
sport
\end{tabular} & 8 & 3 \\
\hline
\begin{tabular}{c}
Does not \\
play a \\
sport
\end{tabular} & 11 & 5 \\
\hline
\end{tabular}



Answer :

To determine the probability that a student chosen randomly from the class plays neither a sport nor an instrument, we'll go through a step-by-step process:

1. Extract the given data from the table:

- Number of students who play both a sport and an instrument: 8
- Number of students who play a sport but do not play an instrument: 3
- Number of students who do not play a sport but play an instrument: 11
- Number of students who neither play a sport nor an instrument: 5

2. Calculate the total number of students in the class:

Sum all the students:
[tex]\[ \text{Total students} = 8 + 3 + 11 + 5 = 27 \][/tex]

3. Identify the number of students who play neither a sport nor an instrument:

From the data, this number is given directly:
[tex]\[ \text{Students who play neither sport nor instrument} = 5 \][/tex]

4. Calculate the probability:

The probability is given by the number of students who play neither a sport nor an instrument divided by the total number of students:
[tex]\[ \text{Probability} = \frac{\text{Number of students who play neither sport nor instrument}}{\text{Total number of students}} = \frac{5}{27} \][/tex]

5. Simplify the fraction (if possible):

Here, [tex]\(\frac{5}{27}\)[/tex] is already in its simplest form.

6. Convert the fraction to a decimal (if necessary):

[tex]\[ \frac{5}{27} \approx 0.18518518518518517 \][/tex]

So, the probability that a student chosen randomly from the class plays neither a sport nor an instrument is approximately [tex]\(0.1852 \text{ or } 18.52\% \)[/tex].