
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
Among the following statements, the correct one is _______ (Please fill in the correct number on the line):
① The mean is not affected by a few extreme values, while the median is affected by every data point in the sample;
② When tossing two coins, the probability of "both showing heads," "both showing tails," and "exactly one coin showing heads" are all equal;
③ In the process of using the frequency distribution of a sample to estimate the population distribution, the larger the sample size, the more accurate the estimate;
④ When randomly throwing a point into a circular area, if the point can fall anywhere in the circle with equal likelihood, then the mathematical model for this random experiment is the classical probability model.

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