Questions: The data to the right represent the top speed (in kilometers per hour) of all the players (except goaltenders) in a certain soccer league. Construct (a) a relative frequency distribution (b) a frequency histogram, and (c) a relative frequency histogram. What percentage of players had a top speed between 26 and 29.9 km/h? What percentage of players had a top speed less than 13.9 km/h?
Speed (km/hr) Number of Players
10-13.9 3
14-17.9 8
18-21.9 18
22-25.9 72
26-29.9 305
30-33.9 235
Transcript text: The data to the right represent the top speed (in kilometers per hour) of all the players (except goaltenders) in a certain soccer league. Construct (a) a relative frequency distribution (b) a frequency histogram, and (c) a relative frequency histogram. What percentage of players had a lop speed between 26 and $29.9 \mathrm{~km} / \mathrm{h}$ ? What percentage of players had a top speed less than $13.9 \mathrm{~km} / \mathrm{h}$ ?
\begin{tabular}{cc}
\hline Speed (km/hr) & Number of Players \\
\hline $10-13.9$ & 3 \\
$14-17.9$ & 8 \\
$18-21.9$ & 18 \\
$22-25.9$ & 72 \\
$26-29.9$ & 305 \\
$30-33.9$ & 235 \\
&
\end{tabular}
Solution
Solution Steps
Step 1: Construct a Relative Frequency Distribution
To construct a relative frequency distribution, we divide the number of players in each speed range by the total number of players.
For speed range 10-13.9 km/hr, the relative frequency is calculated as 3 / 641 = 0
For speed range 14-17.9 km/hr, the relative frequency is calculated as 8 / 641 = 0.01
For speed range 18-21.9 km/hr, the relative frequency is calculated as 18 / 641 = 0.03
For speed range 22-25.9 km/hr, the relative frequency is calculated as 72 / 641 = 0.11
For speed range 26-29.9 km/hr, the relative frequency is calculated as 305 / 641 = 0.48
For speed range 30-33.9 km/hr, the relative frequency is calculated as 235 / 641 = 0.37
Step 2: Construct a Frequency Histogram
A frequency histogram is constructed with speed ranges on the x-axis and the number of players on the y-axis.
Each bar represents a speed range, and the height of the bar corresponds to the number of players in that range.
Speed Range: 10-13.9 km/hr, Number of Players: 3
Speed Range: 14-17.9 km/hr, Number of Players: 8
Speed Range: 18-21.9 km/hr, Number of Players: 18
Speed Range: 22-25.9 km/hr, Number of Players: 72
Speed Range: 26-29.9 km/hr, Number of Players: 305
Speed Range: 30-33.9 km/hr, Number of Players: 235
Step 3: Construct a Relative Frequency Histogram
A relative frequency histogram is similar to the frequency histogram, but the height of each bar corresponds to the relative frequency of players in each speed range.
Speed Range: 10-13.9 km/hr, Relative Frequency: 0
Speed Range: 14-17.9 km/hr, Relative Frequency: 0.01
Speed Range: 18-21.9 km/hr, Relative Frequency: 0.03
Speed Range: 22-25.9 km/hr, Relative Frequency: 0.11
Speed Range: 26-29.9 km/hr, Relative Frequency: 0.48
Speed Range: 30-33.9 km/hr, Relative Frequency: 0.37
Step 4: Calculate Specific Percentages
To find the percentage of players within a specific speed range, multiply the relative frequency by 1.
Percentage of players in speed range 10-13.9 km/hr: 0%
Percentage of players in speed range 14-17.9 km/hr: 1%
Percentage of players in speed range 18-21.9 km/hr: 3%
Percentage of players in speed range 22-25.9 km/hr: 11%
Percentage of players in speed range 26-29.9 km/hr: 48%
Percentage of players in speed range 30-33.9 km/hr: 37%
Final Answer:
The analysis includes a relative frequency distribution, a frequency histogram, a relative frequency histogram, and the calculation of specific percentages within the speed ranges.