
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
Given the frequency distribution histogram of a sample with n rectangles, and a sample size of 300, if the area of the middle rectangle is equal to 1/5 of the total area of the other (n-1) rectangles, determine the frequency of the middle group.

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