The following data represent the number of live births in the United States in 2007 for women

Question:

The following data represent the number of live births in the United States in 2007 for women 15 to 49 years old.
Age .... Live Births
15–19 .... 445,045
20–24 .... 1,082,837
25–29 .... 1,208,405
30–34 .... 962,179
35–39 .... 499,916
40–44 .... 105,071
45–49 .... 7,349
Find
(a) The number of classes,
(b) The class limits, and
(c) The class width.