
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


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Given that the number of students in the 10th, 11th, and 12th grades of a certain high school are 300, 300, and 400, respectively, a stratified sample of 40 students is selected to participate in a survey. Now, if one response is randomly chosen from the collection of completed surveys, determine the probability that it belongs to a 12th-grade student.

Present the answer in LaTex format: \boxed{Your answer}
user