JPCRS
Jun 20, 2011, 10:55 AM
A hamburger chain found that 75% of all customers use mustard, 80% use ketchup, and 65% use both, when ordering a hamburger. What are the probabilities that
a) A ketchup-user uses mustard?
b) A mustard-user uses ketchup?
a) A ketchup-user uses mustard?
b) A mustard-user uses ketchup?