
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 of size 20, the data is grouped into intervals and the corresponding frequency for each interval is as follows: (10, 20], 2; (20, 30], 3; (30, 40], 4; (40, 50], 5; (50, 60], 4; (60, 70], 2. Determine the frequency of the sample in the interval (15, 50].

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