i don't really get the part after the (-4,-6) , what did u write there
I agree with him that’s the answer
Answer:

Step-by-step explanation:
Write the terms of numerator and denominator using a common denominator.

Answer:
9
Step-by-step explanation:
5,7,8,10,12,12
5+7+8+10+12+12=54
54/(how many numbers there are, which is 6)=9.
Your mean value is 9.