What level of measurement is reflected in the following data? (a) A sample number of books read in a year by 50 readers is given below: 15 4 3 11 17 3 10 6 6 10 18 13 5 13 8 16 9 4 7 11 9 14 11 12 8 12 12 6 2 1 1 4 5 5 6 77823 14 17 16 18 16 75 112 12 17 13 9 13 15 14 (b) In a survey of 300 television viewers, 100 were from a low- income group, 150 from a middle-income group, and 50 from a high-income group.