The and variance are derived from a subset of the population data and are used to make inferences about the population. a. population standard deviation.
b. population variance.
c. population mean.
d. sample mean.

“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 .