F 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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z+(z+2)+(z+4)+(z+6)+(z+8)/5=11
5z+20=55
z+4=11
z=7
so last 3 observations are 11,13 and 15
so their mean is 11+13+15/3
39/3=13
so 13 is the answer
5z+20=55
z+4=11
z=7
so last 3 observations are 11,13 and 15
so their mean is 11+13+15/3
39/3=13
so 13 is the answer
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