
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
Given that the final mathematics scores of high school seniors in a certain city follow a normal distribution $X\sim N(85,\sigma ^{2})$, and $P(80 < X < 90)=0.3$, calculate the probability that a randomly selected high school senior's score is not less than $90$ points.

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