The table below shows data from a survey about the amount of time students spend doing homework each week. The students were either in college or in high school: Which of the choices below best describes how to measure the spread of this data?

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.