Question

The mean of 15 observations is 50.The mean of first 8 observations is 48 and last 8 observation is 53. Find eight observation.

Answer 1

the mean of first 8 observation = 48 
sum of first 8 observation = 8 * 48 = 384 

the mean of last 8 observation = 53
the sum of last 8 observation = 53 * 8 = 424

sum of 16 observation = 384 + 424 = 808

sum of 15 observation = 15*50 = 750

8th observation = ( sum of 16 observation) - (sum of 15 observation)
                          =  808 - 750
                         = 58
then 8 observation is 58
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