The following data show the number of hours worked by 200 statistics students (Table 1). Number of Hours Frequency [ 0 - 10) 40 [10 - 20) 50 [20 - 30) 70 [30 - 40) 40 20. Refer to table above. The class width for this distribution a. 9 b. 10 c. 11 d. varies from class to class e. None of the above answers is correct