The mean of 31 results is 60. If the mean of the first 16 results is 58 and that of the last 16 results is 62, find the 16th results.
Mean of 31 results = 60
Sum of 31 results = 31×60 = 1860
Mean of first 16 results = 58
Sum of first 16 results = 58×16 = 928
Mean of last 16 results = 62
Sum of last 16 results = 62×16 = 992
16th result = sum of first 16th results + sum of last 16 results – sum of 31 results
= 992 + 928 – 1860 = 60
So, 16th result is 60.