In a survey, 20 people were asked how many magazines they had purchased during the previous year. The results are shown below:

6 15 3 36 25 18 12 18 5 30 24 7 0 22 33 24 19 4 12 9

Use 4 classes with a class width of 10, and begin with the smallest class limit of 0.

a) What are the 4 lower class limits?

b) What are the 4 upper class limits?

c) What are the 4 class midpoints?

d) What are all the class boundaries? (Make sure you list ALL the class boundaries)

e) Construct a histogram to represent the data. (Use the class boundaries from part d on the horizontal axis.)