UPSC CDS 2 2020 Math Paper

We have the values 25, 65,73,75,83,76,17,15,7,14.
In ascending order , 7, 14,15,17,25,65, 73,75, 76, 83
= 45
deviations from the mean of the set of values = -38, -31, -30, -28, -20, 20,28,30,31,38
So algebraic sum of deviation of the mean of the set of values
= -38-31-30-28-20+20+28+30+31+38
= 0