If the mean of the observations x, 2x+1, 2x+5, 2x+9 is 30, what is the mean of last two observations
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the last two observation is 2x+5,2x+9
30=2x+5+2x+9/2
60=4x+14
60-14/4=x
11.5=x
30=2x+5+2x+9/2
60=4x+14
60-14/4=x
11.5=x
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