Robin surveyed 5 students from the choirs of 4 different schools. he asked them how many hours they practice singing each day. school a: 3, 2, 1, 1, 2 school b: 2, 3, 4, 3, 3 school c: 1, 2, 1, 0, 1 school d: 2, 2, 1, 2, 3 the data for school (,a, b,c, d) has the highest center of distribution. the data for school (a, b,c, d) has the lowest center of distribution.