How do you make a "random range" of a vector3 value?

I was trying to create an explosion that happens randomly across a room, but it just gave me this error:

**** Workspace.Part.Script:1: attempt to call field 'new' (a nil value)

Code

script.Parent.Position = Vector3.new(math.new(55.639,215.394), math.new(0.7,74.4), math.new(1251.478,1413.361))