"You ask students to identify European countries on a map. Onaverage students will identify 10% of the countries correctly. Asimilar test for US states indicates a 45% success rate. Askingstudents to identify 7 European countries and 3 US states, what isthe chance that students will correctly identify at least 50% ofthe countries/states?"
"You have a set of 100 batteries. 13 of these batteries aredefective. Testing 25 batteries, what is the probability to find 3or more of the 25 batteries failing?"
