If the mean of observations x , 2x+1 , 2x+5 , 2x+9 is 30 what is the mean of last 2 observations
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Σx = x+2x+1+2x+5+2x+9 = 7x+15
n = 4(total observations).
mean = Σx/n
30 = 7x+15/4
120-15 = 7x
105/7 = x
x = 15.
n = 4(total observations).
mean = Σx/n
30 = 7x+15/4
120-15 = 7x
105/7 = x
x = 15.
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