Outliers is the value that lies outside, it means, either they are so great or so less, here, as outliers are greater, when it will be removed, your mean will get smaller
100-r=99.52 First, add r to both sides. 100-r+r=99.52+r And then simplify. 100=99.52+r Then, subtract 99.52 from both sides. 100-99.52=99.52+r-99.52 And simplify. 0.48=r So, r=0.48