High School

Note: Please make sure to properly format your answers. All dollar figures in the answers need to include the dollar sign, and any amount over 1,000 should include the comma (e.g., [tex]$\$2,354.67$[/tex]). All percentage values in the answers need to include a percentage sign (e.g., [tex]$82\%$[/tex]). For all items without specific rounding instructions, round your answers to two decimal places, showing both decimal places (e.g., 5.06).

Shannon is traveling from New York City to Washington, D.C. She wants to go by train so she can see the views. Since she will be driving home with a family member, she only priced the cost of a one-way ticket on Amtrak for any time of day on February 15. Below is an ordered listing of all fares that were available for selection on that day.

\[
\begin{tabular}{|lllllllllllllll|}
\hline
49 & 88 & 88 & 88 & 119 & 133 & 133 & 133 & 161 & 171 & 173 & 173 & 173 & 272 & 284 \\
49 & 88 & 88 & 88 & 119 & 133 & 133 & 161 & 161 & 173 & 173 & 173 & 173 & 272 & 284 \\
49 & 88 & 88 & 119 & 119 & 133 & 133 & 161 & 161 & 173 & 173 & 173 & 272 & 272 & 284 \\
88 & 88 & 88 & 119 & 133 & 133 & 133 & 161 & 171 & 173 & 173 & 173 & 272 & 272 & 284 \\
88 & 88 & 88 & 119 & 133 & 133 & 133 & 161 & 171 & 173 & 173 & 173 & 272 & 284 & 284 \\
88 & 88 & 88 & 119 & 133 & 133 & 133 & 161 & 171 & 173 & 173 & 173 & 272 & 284 & 284 \\
\hline
\end{tabular}
\]

a. Find the percentile rank for a fare of [tex]$\$119$[/tex]. [tex]\square[/tex]

b. Find the percentile rank for a fare of [tex]$\$272$[/tex]. [tex]\square[/tex]

c. Based on your first two answers, which train fare would have a percentile rank of approximately [tex]$82\%$[/tex]? [tex]\square[/tex]

Answer :

Certainly! Let's answer each question step-by-step based on the provided fares.

a. Find the percentile rank for a fare of [tex]$119.

To find the percentile rank of a fare, you use the formula:
\[ \text{Percentile Rank} = \frac{\text{Number of fares less than or equal to the fare}}{\text{Total number of fares}} \times 100 \]

Given fare: $[/tex]119

Step-by-step calculation:
1. Count the number of fares less than or equal to [tex]$119.
2. Divide this count by the total number of fares.
3. Multiply the result by 100 to get the percentile rank.

Let's summarize:
- The total number of fares is 90.
- There are 27 fares that are less than or equal to $[/tex]119.

Using the provided solution:
[tex]\[ \text{Percentile Rank for } \$119 = \frac{27}{90} \times 100 \approx 30.00\% \][/tex]

So, the percentile rank for a fare of [tex]$119 is \( \boxed{30.00\%} \).

b. Find the percentile rank for a fare of $[/tex]272.

Given fare: [tex]$272

Step-by-step calculation:
1. Count the number of fares less than or equal to $[/tex]272.
2. Divide this count by the total number of fares.
3. Multiply the result by 100 to get the percentile rank.

Let's summarize:
- The total number of fares is 90.
- There are 82 fares that are less than or equal to [tex]$272.

Using the provided solution:
\[ \text{Percentile Rank for } \$[/tex]272 = \frac{82}{90} \times 100 \approx 91.11\% \]

So, the percentile rank for a fare of [tex]$272 is \( \boxed{91.11\%} \).

c. Based on your first two answers, which train fare would have a percentile rank of approximately 82%?

To find the fare corresponding to the 82nd percentile:
- We need to look at the sorted list of fares and find the fare that approximately matches the 82nd percentile.
- The fare corresponding to a certain percentile means finding the fare where the cumulative percentage is close to that percentile.

Step-by-step:
1. Look through the sorted list of fares.
2. Identify the fare where the percentile rank first reaches or surpasses 82%.

From the given solution:
- The fare which has a percentile rank close to 82% is $[/tex]173.

So, the train fare with approximately 82% percentile rank is [tex]\( \boxed{\$173} \)[/tex].

Here are the final answers for the questions:
a. Percentile rank for [tex]$119 is \( \boxed{30.00\%} \).
b. Percentile rank for $[/tex]272 is [tex]\( \boxed{91.11\%} \)[/tex].
c. Train fare with approximately 82% percentile is [tex]\( \boxed{\$173} \)[/tex].