The mean of a sequence of numbers is the average.
The true statement is: 
The given parameters are:


The mean of a dataset is calculated as:

So, we have:

Multiply both sides by m

When the sequence is split into two, we have:


Where:

So, we have:

Hence, the true statement is: 
Read more about mean and averages at:
brainly.com/question/16217700
Answer: -4 / 8 - 12 / 4 = -16 / 12
Step-by-step explanation:
-4g = (-12 / 4)
2f = (-4 / 8)
Just sum them...