eoin

For finding the solution, You are rite, median is 13.1%.
Now,
For finding quintile,
it is Ly= ((n+1)*y)/100;
so here y=75%.
It is coming out as 10.6
so it will be,
14.2+ 0.6*(14.814.2)=14.56.
So third quantile will be 14.56.