
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
A school has 120 students and 5 teachers. In the first period, each student is taking one class, and each teacher teaches one class. The enrollments in the classes are 60, 30, 15, 10, and 5. Calculate $t - s$, where $t$ is the average number of students per teacher-selected randomly, and $s$ is the average number of students per student-selected randomly including themselves.
A) -16.4
B) -11.4
C) -6.4
D) 6.4
E) 11.4

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