- The total number of students who participated in the survey is \(210\).
- The percentage of students who do not participate in any after-school activities is \(10\%\).
- The number of students is found by multiplying the total by the percentage: \(210 \times 0.10 = 21\).
- The final number of students is \(\boxed{21}\).
Explanation
- Analyze the survey data and identify the goal
The problem provides the total number of students who participated in a survey, which is \(210\). We are given a table detailing the percentages of students involved in various after-school activities. Specifically, we need to determine the number of students who do not participate in any after-school activities, which is indicated as \(10\%\) of the total participants.
- Set up the calculation for the number of students
To find the number of students in a specific category when given a percentage of a total, we use the following formula:
\[ \text{Number of students} = \text{Total students} \times \text{Percentage} \]
Here, the total number of students is \(210\), and the percentage of students who do not participate in any activity is \(10\%\), which can be expressed as a decimal: \(0.10\).
- Calculate the final number of students
We calculate the number of students by multiplying the total number of students by the decimal form of the percentage:
\[ 210 \times 0.10 = 21 \]
Thus, the number of students who do not participate in any after-school activities is \(21\).
Examples
This type of calculation is very common in everyday life, such as when analyzing budget breakdowns or understanding demographic data. For example, if a store has 200 customers and 15% of them used a coupon, you would calculate the number of coupon users by multiplying 200 by 0.15, resulting in 30 customers. This method helps in quickly interpreting percentage-based statistics to make informed decisions.