
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
If the math scores $X$ of 40,000 candidates from a certain city follow a normal distribution with a population density function of $f(x)=\frac{1}{\sigma\sqrt{2\pi}}{e}^{-\frac{{(x-65)}^{2}}{2{\sigma}^{2}}}$, and $P\left(40\leqslant X\leqslant 90\right)=0.9$, calculate the number of candidates in this city whose math scores exceed 90 points.

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