On february 15, 2012, students in stt 201 at michigan state university were asked "how old were you on your last birthday? their responses are tallied in the table below: age: 18 19 20 21 22 25frequency: 102 297 95 111 47 48 find the iqr of the age distribution.

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.