Question

The mean of 11 observations is 50 . If the mean of first six observations i.s 49 and that of last six observations is 52 , then the sixth observation is

Answer 1

the sixth observation will be 56

Answer 2

'average of 11 observations is 72' gives you total 792..
add the 6 obsns with separate averages together..
6*70+6*71=846...
so 846 is total of 12 observations where the 6th obsn has been added twice..
so the 6th obsn will be 846-792=54..