How do i figure out which stock is most volatile

Question

Mean Closing price common stock a is 143.1 with a standard deviation of 18.6 mean closing for stock b is 82.5 with a standard deviation of 8.2 which is more volatile

Answer 1

18.6/143.1=0.129979035=12.998% or bout 13%... 8.2/82.5=0.099393939393939393=9.94% or bout 10%