
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]


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In a high school mathematics joint examination, the mathematics scores of a certain school are represented by $X\sim N(80$,$\sigma ^{2})$. Given that $P\left(60\leqslant X\leqslant 80\right)=0.25$, the probability of randomly selecting a student from the entire school whose mathematics score is less than $100$ points is ______.

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