
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
A sample of size $20$ has grouped data with class intervals and frequencies 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 $[50, +\infty)$.

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