Question

If the mean of five observations is x,x+2,x+4,x+6,x+8 is 11 .Find the mean of first three observations​

Answer 1

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Answer 2

X+x+2+x+4+x+6+x+8/5=11

5x+20/5=11

5x+20=55

5x=35

x=7

first three observations are x,x+2,x+4=7,9,11

7+9+11/3=27/3=9

Therefore the mean of first three numbers is 9