The mean of the observation x,2x+1,and 2x+9 is 30.what is the mean of first three observations.
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The mean of the observation x,2x+1,and 2x+9 is 30
Mean =( x+2x+1+2x+9)/3
30= (5x+10)/3
90=5x+10
90-10=5x
80= 5x
X= 16
Mean =( x+2x+1+2x+9)/3
30= (5x+10)/3
90=5x+10
90-10=5x
80= 5x
X= 16
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