5. A group of volleyball players consists of four grade-11 students and six grade-12 students. If six players are chosen at random to start a match, what is the probability that three will be from each grade? (2 marks, A) 6. Suppose you simultaneously flip a coin and spin a spinner that is divided into 8 equal sectors, numbered 1 to 8. What is the probability of getting heads and 9? (2 marks, K) 7. A bag contains three green marbles, seven blue and four black marbles. If you randomly pick a marble from the bag, what is the probability that it will be black or green? (2 marks, K)