
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 knowledge competition, the initial scores of four teams were all 100 points. During the question-answering process, each team could increase their score by 5 points for each correct answer. If the number of questions answered correctly by the four teams were 4, 7, 7, and 2, respectively, calculate the variance of the scores of the four teams.

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