Answer :
To compute the row percentages for each make of car (Buick/Chevrolet and Dodge/Ford) based on the given table, we need to determine what percentage each cell's value represents of its row total. The row totals are provided, so we will use them for our calculations.
### Row Totals
- For Buick and Chevrolet combined: 16 winners.
- For Dodge and Ford combined: 9 winners.
### Buick/Chevrolet Calculations
For Buick and Chevrolet, let's calculate the row percentages for each speed category:
1. 130-139.9 mph:
- Winners: 1 (Buick) + 3 (Chevrolet) = 4
- Percentage: [tex]\( \frac{4}{16} \times 100 = 25.0 \% \)[/tex]
2. 140-149.9 mph:
- Winners: 5
- Percentage: [tex]\( \frac{5}{16} \times 100 = 31.25 \% \)[/tex]
3. 150-159.9 mph:
- Winners: 4
- Percentage: [tex]\( \frac{4}{16} \times 100 = 25.0 \% \)[/tex]
4. 160-169.9 mph:
- Winners: 3
- Percentage: [tex]\( \frac{3}{16} \times 100 = 18.75 \% \)[/tex]
5. 170-179.9 mph:
- Winners: 1
- Percentage: [tex]\( \frac{1}{16} \times 100 = 6.25 \% \)[/tex]
So the row percentages for Buick/Chevrolet are:
[tex]\[ [25.0, 31.25, 25.0, 18.75, 6.25] \% \][/tex]
### Dodge/Ford Calculations
For Dodge and Ford, let's calculate the row percentages for each speed category:
1. 130-139.9 mph:
- Winners: 2
- Percentage: [tex]\( \frac{2}{9} \times 100 = 22.22 \% \)[/tex]
2. 140-149.9 mph:
- Winners: 3
- Percentage: [tex]\( \frac{3}{9} \times 100 = 33.33 \% \)[/tex]
3. 150-159.9 mph:
- Winners: 2
- Percentage: [tex]\( \frac{2}{9} \times 100 = 22.22 \% \)[/tex]
4. 160-169.9 mph:
- Winners: 1
- Percentage: [tex]\( \frac{1}{9} \times 100 = 11.11 \% \)[/tex]
5. 170-179.9 mph:
- Winners: 0
- Percentage: [tex]\( \frac{0}{9} \times 100 = 0.0 \% \)[/tex]
So the row percentages for Dodge/Ford are:
[tex]\[ [22.22, 33.33, 22.22, 11.11, 0.0] \% \][/tex]
### Final Result
The row percentages, rounded to two decimal places, are as follows:
- Buick/Chevrolet:
[tex]\[ 25.00\%, 31.25\%, 25.00\%, 18.75\%, 6.25\% \][/tex]
- Dodge/Ford:
[tex]\[ 22.22\%, 33.33\%, 22.22\%, 11.11\%, -0.00 \][/tex]
These percentages represent how the total for each speed category contributes to the overall total for each car make.
### Row Totals
- For Buick and Chevrolet combined: 16 winners.
- For Dodge and Ford combined: 9 winners.
### Buick/Chevrolet Calculations
For Buick and Chevrolet, let's calculate the row percentages for each speed category:
1. 130-139.9 mph:
- Winners: 1 (Buick) + 3 (Chevrolet) = 4
- Percentage: [tex]\( \frac{4}{16} \times 100 = 25.0 \% \)[/tex]
2. 140-149.9 mph:
- Winners: 5
- Percentage: [tex]\( \frac{5}{16} \times 100 = 31.25 \% \)[/tex]
3. 150-159.9 mph:
- Winners: 4
- Percentage: [tex]\( \frac{4}{16} \times 100 = 25.0 \% \)[/tex]
4. 160-169.9 mph:
- Winners: 3
- Percentage: [tex]\( \frac{3}{16} \times 100 = 18.75 \% \)[/tex]
5. 170-179.9 mph:
- Winners: 1
- Percentage: [tex]\( \frac{1}{16} \times 100 = 6.25 \% \)[/tex]
So the row percentages for Buick/Chevrolet are:
[tex]\[ [25.0, 31.25, 25.0, 18.75, 6.25] \% \][/tex]
### Dodge/Ford Calculations
For Dodge and Ford, let's calculate the row percentages for each speed category:
1. 130-139.9 mph:
- Winners: 2
- Percentage: [tex]\( \frac{2}{9} \times 100 = 22.22 \% \)[/tex]
2. 140-149.9 mph:
- Winners: 3
- Percentage: [tex]\( \frac{3}{9} \times 100 = 33.33 \% \)[/tex]
3. 150-159.9 mph:
- Winners: 2
- Percentage: [tex]\( \frac{2}{9} \times 100 = 22.22 \% \)[/tex]
4. 160-169.9 mph:
- Winners: 1
- Percentage: [tex]\( \frac{1}{9} \times 100 = 11.11 \% \)[/tex]
5. 170-179.9 mph:
- Winners: 0
- Percentage: [tex]\( \frac{0}{9} \times 100 = 0.0 \% \)[/tex]
So the row percentages for Dodge/Ford are:
[tex]\[ [22.22, 33.33, 22.22, 11.11, 0.0] \% \][/tex]
### Final Result
The row percentages, rounded to two decimal places, are as follows:
- Buick/Chevrolet:
[tex]\[ 25.00\%, 31.25\%, 25.00\%, 18.75\%, 6.25\% \][/tex]
- Dodge/Ford:
[tex]\[ 22.22\%, 33.33\%, 22.22\%, 11.11\%, -0.00 \][/tex]
These percentages represent how the total for each speed category contributes to the overall total for each car make.