10 - 3.9
10.0
3.9
-----------------
6.1
------------------
They're equal. I ran both equations through a graphing calculator and they share the same line.
Answer:
x+2
Step-by-step explanation:
The firs 3 observations are x, x+2, x+4
Mean = sum of data/samaple size
Mean = x+x+2+x+4/3
MEan = 3x+6/3
Mean = 3(x+2)/3
Mean = x+2
Hence the required mean is x+2