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Answer :
- Count students who used computers (hours > 0): 18.
- Calculate the ratio of users to total students: $\frac{18}{20}$.
- Simplify the ratio: $\frac{18}{20} = \frac{9}{10}$.
- The ratio of students who used their computers to the total number of students surveyed is $\boxed{\frac{9}{10}}$.
### Explanation
1. Understand the problem and provided data
We are given the number of hours 20 students spend on their computers each week. The data is: $8, 15, 0, 11, 12, 13, 16, 13, 0, 4, 17, 14, 30, 13, 5, 12, 1, 13, 12, 21$. We need to find the ratio of the number of students who used their computers (spent more than 0 hours) to the total number of students surveyed (20).
2. Count the number of students who used their computers
First, let's count the number of students who spent more than 0 hours on their computers. These are the students who used their computers. From the data, we can see that 18 students spent more than 0 hours on their computers.
3. Calculate the ratio
Now, we need to find the ratio of the number of students who used their computers to the total number of students surveyed. This is $\frac{18}{20}$.
4. Simplify the fraction and conclude
Finally, we simplify the fraction $\frac{18}{20}$ by dividing both the numerator and the denominator by their greatest common divisor, which is 2. So, $\frac{18}{20} = \frac{18 \div 2}{20 \div 2} = \frac{9}{10}$.
### Examples
This type of ratio calculation is useful in many real-world scenarios. For example, a school might want to know the proportion of students who use the library regularly to justify funding. Similarly, a company might track the percentage of employees who use a particular software to assess its adoption rate and plan training programs.
- Calculate the ratio of users to total students: $\frac{18}{20}$.
- Simplify the ratio: $\frac{18}{20} = \frac{9}{10}$.
- The ratio of students who used their computers to the total number of students surveyed is $\boxed{\frac{9}{10}}$.
### Explanation
1. Understand the problem and provided data
We are given the number of hours 20 students spend on their computers each week. The data is: $8, 15, 0, 11, 12, 13, 16, 13, 0, 4, 17, 14, 30, 13, 5, 12, 1, 13, 12, 21$. We need to find the ratio of the number of students who used their computers (spent more than 0 hours) to the total number of students surveyed (20).
2. Count the number of students who used their computers
First, let's count the number of students who spent more than 0 hours on their computers. These are the students who used their computers. From the data, we can see that 18 students spent more than 0 hours on their computers.
3. Calculate the ratio
Now, we need to find the ratio of the number of students who used their computers to the total number of students surveyed. This is $\frac{18}{20}$.
4. Simplify the fraction and conclude
Finally, we simplify the fraction $\frac{18}{20}$ by dividing both the numerator and the denominator by their greatest common divisor, which is 2. So, $\frac{18}{20} = \frac{18 \div 2}{20 \div 2} = \frac{9}{10}$.
### Examples
This type of ratio calculation is useful in many real-world scenarios. For example, a school might want to know the proportion of students who use the library regularly to justify funding. Similarly, a company might track the percentage of employees who use a particular software to assess its adoption rate and plan training programs.
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