
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 a sample data with a volume of 20, the groups have been created with the following class intervals and frequencies: $(10, 20]$, 2; $(20, 30]$, 3; $(30, 40]$, 4; $(40, 50]$, 5; $(50, 60]$, 4; $(60, 70]$, 2. Calculate the frequency of the sample in the interval $(50, 70]$.

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