
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]


system
In a certain high school, there are 400 students in Grade 10, 320 students in Grade 11, and 280 students in Grade 12. When using a simple random sampling method to draw a sample of size $n$, it is known that each individual has a 0.2 probability of being selected. Then $n= \;?$

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