
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 April of this year, the daily highest temperatures (in °C) of a certain week in our city were as follows: 19, 21, 25, 22, 19, 22, 21. The median of this set of data is ______.

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