if the arithmetic mean of x , x+3, x+6,x+9and x+12 is 10 then x =
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Sum of all observation = x+x+3+x+6+x+9+x+12
= 5x+30
Number of observation =5
Mean= 10
Mean = (5x+30)/5
10= 5x+30/5
10×5 =5x+30
50=5x+30
5x=50-30
5x=20
x=20/5
x=4
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