Does a distribution curve have to be symmetric in order to include standard deviations?

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .

About a 30 to 45% because if you want a shiny pokemon with no shiny charm that going to be hard so good luck