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If the mean of the observation x , 2x+1 , 2x+5 , 2x+ 9 is 30 what is the mean of last to observations ? |
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Answer» x+2x+1+2x+5+2x+9=30*4 7x+15=120 x=105/7 x=15 last TWO OBSERVATIONS are 2x+5 and 2x+9 =14+5 and 14+9 mean=(19+23)/2 mean=42/2=21 |
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