5.4.3 Quiz: Two-Way Frequency Tables

Question 1 of 10:

Northlake High School has two lunch periods. Students can eat their lunch in the cafeteria or on an outside patio. About [tex]31\%[/tex] of students who have first lunch eat outside. Compare this with the percentage of second-lunch students who eat outside.

\begin{tabular}{|c|c|c|c|}
\hline & Eat outside & Eat inside & Total \\
\hline First lunch & 0.17 & 0.38 & 0.55 \\
\hline Second lunch & 0.21 & 0.24 & 0.45 \\
\hline Total & 0.38 & 0.62 & 1.0 \\
\hline
\end{tabular}

Select the true statement.



Answer :

To determine the percentage of second-lunch students who eat outside, we can use the given data from the frequency table. Let's break down the process step-by-step:

1. Identify the relevant data:
- For first lunch:
- Students who eat outside: 0.17
- Total students: 0.55

- For second lunch:
- Students who eat outside: 0.21
- Total students: 0.45

2. Calculate the percentage of first-lunch students who eat outside:
- We are given that [tex]$31 \%$[/tex] of students who have first lunch eat outside. This is already provided in the problem.

3. Calculate the percentage of second-lunch students who eat outside:
- We need to calculate this value using the provided data.

4. Perform the calculation for second-lunch students:
- The formula to find the percentage is:
[tex]\[ \text{Percentage} = \left( \frac{\text{Number of students who eat outside}}{\text{Total number of students}} \right) \times 100 \][/tex]
- Plugging in the values for second lunch:
[tex]\[ \text{Percentage of second-lunch students who eat outside} = \left( \frac{0.21}{0.45} \right) \times 100 \approx 46.67\% \][/tex]

Thus, the percentage of second-lunch students who eat outside is approximately [tex]\(46.67 \%\)[/tex].

Comparing the percentages:
- Percentage of first-lunch students who eat outside: [tex]\(31 \%\)[/tex]
- Percentage of second-lunch students who eat outside: [tex]\(46.67 \%\)[/tex]

This comparison shows that a higher percentage of students eat outside during the second lunch (approximately [tex]\(46.67\%\)[/tex]) compared to the first lunch ([tex]\(31\%\)[/tex]).

True Statement:
- "A higher percentage of students eat outside during the second lunch compared to the first lunch."