
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
From a pile of apples, 5 are randomly selected, and their weights are as follows (unit: grams): 125, 124, 121, 123, 127. Then, the sample standard deviation $s$ is $\_\_\_\_\_\_\_\_$ (grams) (answer in digits).

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