
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
An inspector, checking the quality of 400 items, determined that 20 of them belong to the second grade, and the rest to the first grade. Find the frequency of first-grade items and the frequency of second-grade items.

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