If the mean of 5 observation z, z + 2, z + 4, z + 6 and z + 8 is 11, then the mean of the last three observation is
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Mean = (z + z+2 + z+4 + z+6 + z+8 ) /5 = 11
or 5z + 20 = 55
or z = 7
So last three observations are :- (7+4) , (7+6) , (7+8)
i.e. 11,13,15
So mean = (11+13+15)/3 = 39/3 = 13
or 5z + 20 = 55
or z = 7
So last three observations are :- (7+4) , (7+6) , (7+8)
i.e. 11,13,15
So mean = (11+13+15)/3 = 39/3 = 13
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