Tracking Risk Formula

Looking at CFA Reading 27 Practice Problem#1 can anyone help me with how they go from .28284 to 19.278

volume #, page #…make it easy on us and we’ll help…but i’m not searching for reading 27 and the page number…

19.728 bps is errata 28.284 bps is the right answer use Data/Stat function on BA II Plus and compute sample standard deviation to confirm, or you can do it manually, just remember to use active return in decimals and convert to %'s at the end