Posted by overwhelmed on .
I am having trouble knowing if I add or multiply with this problem:
Male Female
Age 19 and under 4746 4517
Age 20 1625 1553
Age 21 1679 1627
Choose one driver at random. Find the probability that the driver is Male and 19 or under.
Now, do I find the product of the number of males and the number of drivers 19 or under? Or do I add and subtract:

statistics 
PsyDAG,
If these are the number of subjects, then you want 4746/grand total = ?