
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 3 factories producing the same type of electronic product. The production ratio of the first, second, and third factories is 1:2:1. Using stratified sampling method (each factory's products as one layer), a total of 100 units are sampled from the electronic products produced by the 3 factories for a lifespan test. Based on the test results, the average lifespans of the products taken from the first, second, and third factories are 980h, 1020h, and 1032h, respectively. The average lifespan of the sampled 100 units is \_\_\_\_\_\_\_\_\_ h.

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