A weather researcher compared average monthly temperature data for Buenos Aires, Argentina, and Rio de Janeiro, Brazil.

\begin{tabular}{|l|l|l|}
\hline & Buenos Aires & Rio de Janeiro \\
\hline Mean & [tex]$65^{\circ} F$[/tex] & [tex]$76.5^{\circ} F$[/tex] \\
\hline Range & [tex]$16.3^{\circ} F$[/tex] & [tex]$11.1^{\circ} F$[/tex] \\
\hline
\end{tabular}

Based on these data, which statements are true?

A. On average, Buenos Aires has a higher monthly temperature. Its monthly temperatures also vary more.

B. On average, Buenos Aires has a higher monthly temperature. However, temperatures in Rio de Janeiro vary more.

C. On average, Rio de Janeiro has a higher monthly temperature. Its monthly temperatures also vary more.

D. On average, Rio de Janeiro has a higher monthly temperature. However, temperatures in Buenos Aires vary more.



Answer :

To solve this question, we need to analyze the average monthly temperature and the range of monthly temperatures for both cities, Buenos Aires and Rio de Janeiro.

First, let's take a look at the data given:

- Buenos Aires:
- Mean temperature: [tex]\(65^{\circ} F\)[/tex]
- Range of temperatures: [tex]\(16.3^{\circ} F\)[/tex]

- Rio de Janeiro:
- Mean temperature: [tex]\(76.5^{\circ} F\)[/tex]
- Range of temperatures: [tex]\(11.1^{\circ} F\)[/tex]

Now, we need to determine which city has the higher average temperature and which city's temperatures vary more.

### Step 1: Determine which city has the higher average temperature

- Buenos Aires: [tex]\(65^{\circ} F\)[/tex]
- Rio de Janeiro: [tex]\(76.5^{\circ} F\)[/tex]

Comparison:
[tex]\[ 76.5^{\circ} F > 65^{\circ} F \][/tex]

Thus, Rio de Janeiro has the higher average monthly temperature.

### Step 2: Determine which city's temperatures vary more

- Buenos Aires: [tex]\(16.3^{\circ} F\)[/tex]
- Rio de Janeiro: [tex]\(11.1^{\circ} F\)[/tex]

Comparison:
[tex]\[ 16.3^{\circ} F > 11.1^{\circ} F \][/tex]

Thus, Buenos Aires has more variation in its monthly temperatures.

### Step 3: Match these findings to the given statements

Based on the analysis:

1. Rio de Janeiro has a higher average monthly temperature.
2. Buenos Aires has more variation in its monthly temperatures.

Let's compare this with the provided statements:

- Statement A: On average, Buenos Aires has a higher monthly temperature. Its monthly temperatures also vary more.
- This statement is false because Rio de Janeiro has a higher average temperature.

- Statement B: On average, Buenos Aires has a higher monthly temperature. However, temperatures in Rio de Janeiro vary more.
- This statement is false because Rio de Janeiro has the higher average temperature, not Buenos Aires, and Buenos Aires has more variation.

- Statement C: On average, Rio de Janeiro has a higher monthly temperature. Its monthly temperatures also vary more.
- This statement is false because, while Rio de Janeiro does have the higher average temperature, its temperatures vary less, not more.

- Statement D: On average, Rio de Janeiro has a higher monthly temperature. However, temperatures in Buenos Aires vary more.
- This statement is true because it accurately states that Rio de Janeiro has the higher average temperature and Buenos Aires has more variation in temperatures.

Thus, the correct statement is D: On average, Rio de Janeiro has a higher monthly temperature. However, temperatures in Buenos Aires vary more.