
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 batch of light bulbs, 10 are randomly selected for a lifespan test. Their lifespans (in hours) are as follows:  
1050, 1100, 1120, 1280, 1250, 1040, 1030, 1110, 1240, 1300. Calculate the point estimate of the standard deviation of the lifespan of this batch of light bulbs. (Round the result to one decimal place.)

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