
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 company has three branches that produced a total of 1000 units of the same electronic product within a month. The production ratio of the first, second, and third branches is 1:2:1. Using stratified sampling method (each branch's products as one stratum), 100 units were selected from the production of the three branches for a lifespan test. The average lifespans of the products from the first, second, and third branches were found to be 980h, 1020h, and 1032h, respectively. Estimate the average lifespan of the products produced by the company this month.

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