Can someone please assist in helping me find the Standard Deviation of the below equation with the steps to get to the solution?

[(-29.5 - 9.9)^2(0.1) + (-9.5 - 9.9)^2(0.2) + (12.5 - 9.9)^2(0.4) + (27.5 - 9.9)^2(0.2) + (42.5 - 9.9)^2(0.1)]^1/2