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: 
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The answer is C 24 if you plug in 33 33 = 9 + b you have to subtract the 9 over to 33 to get 24