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The image contains three questions related to COVID-19 statistics in an educational institution. Here's a translation and breakdown of the questions:

**Question 28:**
_According to the previous information, how many students in total could be infected with COVID-19 and be asymptomatic?_
- A. 1850 students
- B. 495 students
- C. 490 students
- D. 360 students

**Question 29:**
_What is the approximate percentage of students infected by COVID-19 and asymptomatic, out of the total number of students in the educational institution?_
- A. 28% approximately
- B. 25% approximately
- C. 26.7% approximately
- D. 30% approximately

**Question 30:**
_The use of masks by students inside the institution has reduced the contagion rate by 30 students per day in each group. If this continues, what will the contagion percentage be among those over 12 years old after 5 days?_
- A. 30%
- B. 25%
- C. 20%
- D. 15%

Would you like further clarification on these questions, or help solving them?

### Related Questions:
1. How do you calculate percentages of infected students in a population?
2. What is the method for estimating the reduction of infection rates based on daily decrease data?
3. How can statistical assumptions help determine asymptomatic cases?
4. What other factors could influence the infection rate in educational settings besides mask usage?
5. How can statistical trends from these questions help inform public health strategies?

**Tip:** When estimating the percentage of a population infected, always ensure the total population is known to apply the correct percentage formula: \((\text{number of cases} / \text{total population}) \times 100\).

According to the previous information, how many students in total could be infected with COVID-19 and be asymptomatic? What is the approximate percentage of students infected by COVID-19 and asymptomatic, out of the total number of students in the educational institution? The use of masks by students inside the institution has reduced the contagion rate by 30 students per day in each group. If this continues, what will the contagion percentage be among those over 12 years old after 5 days?

Explore the calculation of COVID-19 infection percentages and the impact of mask usage in reducing the contagion rate in schools. Learn how to calculate the percentage of asymptomatic cases and the effect of daily infection reduction over time.

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