Here are the times (in minutes) that six students need to finish a quiz: 10,14,15,15,14,10 Find the mean deviation for this data
A) 4.67
B) 13
C) 2
D) 2.16

If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.