I’m completely confused by the calculation of downside deviation from the CFAI material.

According to CFAI material page 23 ,

downside deviation = square root of sum min(rt - r*, 0)^2 divided by n-1

however the answer for EOC 12 is using a different formula: square root of sum min(rt - r*, 0)^2 divided by n-1, then multiply sq rt of n. Why there is such a difference? Also the hurdle rate is not given in the question, but the answer assumes it’s 5%. Shall we do the same on the exam?