
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
As the Spring Festival approaches, the number of passengers passing through three security checkpoints at a certain train station daily follows a normal distribution $N\left( 1000,{{\sigma }^{2}} \right)$ (in units of people). Given that $P\left( 900 < X\leqslant 1100 \right)=0.6$, assuming all three security checkpoints are functioning normally, the probability that at least two of these three security checkpoints will have more than $1100$ passengers per day is ________.

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