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

a. in her 50s.

b. less than 50 years old.

c. between 40 and 69 years old, inclusive.

d. 70 years old or older.