
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
In a class of 40 students, $20\%$ scored 65 points, $30\%$ scored 75 points, $15\%$ scored 80 points, $25\%$ scored 90 points, and the remaining students scored 100 points. What is the difference between the mean and the median score of this exam?
A) 3
B) 4
C) 5 
D) 6
E) 7

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