
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
The survival probability of a certain type of sapling is $\dfrac{9}{10}$. Now, $1000$ of these saplings have been planted, and the survival of each sapling is independent of the others. Let $X$ denote the number of saplings that did not survive. Then, the variance of $X$ is ______.

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