If the mean of 5 observations x , x +2 , x +4 , x +6 and x +8 is 11 , then the mean of last three observations is
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If the mean of 5 observations x , x +2 , x +4 , x +6 and x +8 is 11
If the mean of 5 observations x , x +2 , x +4 , x +6 and x +8 is 11 , then the mean of last three observations is
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Answer:
Mean= {x+(x+2)+(x+4)+(x+6)+(x+8)}/5=11
(5x+20)/5=11
x+4=11
x=7
Mean of last three observation={x+4+x+6+x+8}/3
=(3x+18)/3=x+6
Now put the value of x =7 in x+6
New mean=7+6=13