Having trouble with question 12A in SS 13 (Alternatives). How does the ciriculum arrive at the 28.78 that is in the numerator of the formula? I thought Downside Deviation = [Sum( Min(ARi - RRi , 0))^2 / (n-1)]^0.5

I guess 28.78 is suppposed to be this part = Sum( Min(ARi - RRi , 0))^2

But this is not what I am getting… Is this correct?