I need help for two tasks:

1. Twogroups, A and B wrote an exam. There are 60 students in group A and 70 studentsin group B. The probability of A students’ pass is 0.3 and the probability of Bstudents' pass is 0.5. What is the expected number of students who will take the exam? What is the probability that only one studentto pass the exam?

2. Aplayer tosses two coins, betting 50 cent. He wins 20 cent for each fallen head.What is the expected winnings in a single toss? What should be the amount of winningsin order the game to be fair (not possible tendency for the player to win orlose)?