If the mean of observations x,x+2,x+4,x+6,x+8 is11,find:
1) the value of x;
2) the mean of first three observations.

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x+x+2+x+4+x+6+x+8/5=11 theefore adding all we get 5x+20/5=11 = x+ 4 = 11 = x = 7 now putiing value of in i , ii and iii 7+ 9 + 11/3 = 27/3= 9 there meano of first three = 9 and x = 7. Formula used = sum of all observation / total no of observation
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