A random sample of size n is to be drawn from a population with a mean =900 and standard deviation =200 .What size sample would be necessary in order to ensure a standard error of 25 ?

“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 .