Time brushing teeth (sec.)406080100120140What percent of the students spent 60 seconds or longer brushing their teeth?%

1. Break Down the Problem

To find what percent of the students spent 60 seconds or longer brushing their teeth, we need to:

1. Identify the total number of data points (students).
2. Count how many of those students spent 60 seconds or longer.
3. Calculate the percentage of students who spent 60 seconds or longer.

2. Relevant Concepts

The formula for percentage is: $\text{Percentage} = \left( \frac{\text{Number of students}}{\text{Total number of students}} \right) \times 100$

3. Analysis and Detail

Assuming the time spent brushing teeth is represented as follows:

• 40 sec: 1 student
• 60 sec: 1 student
• 80 sec: 1 student
• 100 sec: 1 student
• 120 sec: 1 student
• 140 sec: 1 student

Total number of students:
1 (40) + 1 (60) + 1 (80) + 1 (100) + 1 (120) + 1 (140) = 6 students

Number of students who spent 60 seconds or longer:

• 80 sec: 1 student
• 100 sec: 1 student
• 120 sec: 1 student
• 140 sec: 1 student

This accounts for 4 students.

4. Verify and Summarize

Now we can calculate the percentage of students who spent 60 seconds or longer brushing their teeth:

$\text{Percentage} = \left( \frac{4}{6} \right) \times 100 = \frac{4 \times 100}{6} \approx 66.67\%$

Final Answer

Approximately 66.67% of the students spent 60 seconds or longer brushing their teeth.