Math
posted by Alex .
In a recent year there were the following numbers (in thousands) of licensed drivers in the United States.
MALE:
Age 19 and under  4746
Age 20  1625
Age 21  1679
FEMALE:
Age 19 and under  4517
Age 20  1553
Age 21  1627
Choose one driver at random. Find the probability that the driver is:
a. Male and 19 or under
b. Age 20 or female
c. At least 20 years old.
Thanks for your help!

A. 4746/(grand total) = ?
Grand total is the sum of all the observations.
B. Eitheror probabilities are found by adding the individual probabilities.
(All age 20/grand total) + (all female/grand total) = ?
C. (all 20+)/(grand total) = ?