Thirty computer users were asked to record the number of spam e-mails they received in the past week. After a week, they reported the following data:
24, 3, 18, 27, 13, 5, 2, 10, 7, 21, 5, 3, 1, 0, 23, 15, 4, 3, 9, 4, 2, 15, 6, 2, 17, 8, 4, 5, 17, 2
a. Create a grouped frequency table in 2-spam intervals.
b. Create a grouped frequency table in 5-spam intervals.
c. Create a grouped frequency table in 10-spam intervals.
d. Which table gives the clearest picture of the data?