The Highway Patrol, using radar, checked the speeds (in mph) of 30 passing motorists at a checkpoint. The results are listed below. Construct an ogive using six classes.

44 38 41 50 36 36 43 42 49 48 35 40 37 41 43 50 45 45 39 38 50 41 4 47 36 35 40 42 43 48 33