1No values, binwidth 0 should fail. 2No values, binwidth 1 should fail. 3One value, binwidth 1: 4( 1 ) 51, 2, 3, 4, 5, binwidth 1: 6( 1 2 3 4 5 ) 71, 2, 3, 4, 5, binwidth 2: 8( 1.5 2.5 3.5 4.5 ) 9