What is the mean of X, X+3,X+6,X+9,and X +12?
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==> x,x+3,x+6,x+9,x+12
==> x,x+3,x+6,x+9,x+12
5
==> 5x+30
5
==> 35x
5
==> 7x
mean = 7x
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