A quantitative data set has been grouped by using limit grouping with equal-width classes. The lower and

Question:

A quantitative data set has been grouped by using limit grouping with equal-width classes. The lower and upper limits of the first class are 3 and 8, respectively, and the class width is 6.
a. What is the class mark of the second class?
b. What are the lower and upper limits of the third class?
c. Which class would contain an observation of 23?