Chapter 4.1, Problem 18E

In Exercises 4.16–4.26, express your probability answers as a decimal rounded to three places.

4.18 Cardiovascular Hospitalizations. From the Florida State Center for Health Statistics report Women and Cardiovascular Disease Hospitalization, we obtained the following table showing the number of female hospitalizations for cardiovascular disease, by age group, during one year.

Age group (yr)	Number
0–19	810
20–39	5,029
40–49	10,977
50–59	20,983
60–69	36,884
70–79	65,017
80 and over	69,167

One of these case records is selected at random. Find the probability that the woman was

1. a. in her 50s.
2. b. less than 50 years old.
3. c. between 40 and 69 years old, inclusive.
4. d. 70 years old or older.