The mean of five observation x,x+2 ,+6,x+8 is 11 find the mean of first three observation
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The mean of five observation x,x+2,x+4 ,x+6,x+8 is 11 find the mean of first three observation
x,x+2 ,x+4,x+6,x+8
Mean =(x+x+2+x+4+x+6+x+8)/5=11
5x+20=5*11
5x=55-20=35
x=35/5=7
Now mean of three terms
=(x+x+2+x+4)/3
=(3x+6)/3
=x+2
=7+2=9
=1/15(117+40)
=157/15
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