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Let's go through the questions shown in the image one by one:

### Question 36
- **Problem**: In an experiment of tossing 3 coins 120 times, what is the expected frequency of getting at least 2 heads?
  
To solve this, we can use probability principles. Tossing 3 coins gives 8 possible outcomes, and we need to calculate the probability of getting at least 2 heads, then multiply by 120 to find the frequency.

### Question 37
- **Problem**: Given an arithmetic sequence where \( U_2 = 9 \) and \( U_5 = 21 \). What is the sum of the first 6 terms of the sequence?
  
We'll need to find the common difference \(d\) and the first term \(U_1\), then calculate the sum of the first 6 terms using the formula for the sum of an arithmetic sequence.

### Question 38
- **Problem**: From the digits 4, 5, 6, 7, 8, and 9, three-digit numbers are formed using different digits. How many such three-digit numbers are less than 900?
  
This is a combinatorial problem involving permutations of digits and setting conditions for the hundreds place to be less than 9.

### Question 39
- **Problem**: Solve the logarithmic expression \( {}^7\log 3 + {}^7\log 24 - {}^7\log 9 \).
  
We can use logarithmic properties to simplify this expression.

### Question 40
- **Problem**: The diagram below shows sports favored by students in a class. If 2 students like running, how many total students are in the class?
  
The answer will depend on interpreting the diagram that isn't visible in this image.

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In an experiment of tossing 3 coins 120 times, what is the expected frequency of getting at least 2 heads?

Calculate the expected frequency of getting at least 2 heads when tossing 3 coins 120 times. Learn how to apply probability theory, combinatorics, and the binomial distribution formula. Suitable for students in Grades 9-12.

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