Weird Yield Standard Deviation Formula

Annual Standard Deviation = Standard Deviation Daily x (# of trading days in the year)^(1/2) Can anyone help me understand why we are taking the square root of # of trading days in the year? I have a feeling I am missing something so basic… Thank you in advance.

Annual Variance = daily Variance * #trading days

so

Annual Variance ^(1/2)= daily Variance^(1/2) * #trading days ^(1/2)

Annual Standard Deviation = Standard Deviation Daily x (# of trading days in the year)^(1/2)

wow, I didn’t realize it came out because of that.

lol,

that’s the actuary perspective . haha

haha perfect. thanks summerside