can someone please check my answers.

Question

7. A married couple is expecting another child. They already have 3 boys. What are the chances of them having another boy? 1/4
8. After having had the four boys the couple is expecting another child. What is the chance of them having another boy? 1/16
9. Suppose a father has 2 genes for eye color (Blue and brown) and the mother also has 2 genes for eye color (blue and brown_ each parent conveys only one gene of a pair. What is the chance that the child will receive a brown gene from the father? 1/4
10. What is the chance that the child will receive a blue gene from the father? 1/2
11. What is the chance that the child with receive 2 blue genes, one from each? 1/2
12. You are trying to predict the outcome of 3 horse races. Horse A is given 3/4 chance to win the 1st race. Horse B is given 1/2 chance and Horse C is given 1/8 chance. You bet on all the horses. What is your chance of winning the triple bet? 3/64
13. There are 3000 bluegill sunfish and 2000 carps. What is the chance a bluegill will bite on your fishing hook? 3000/5000 = 3/5
14. There are 12 coupon books inside a box. 2 of them are $10 prizes. What is the chance of drawing a $10 prize? 1/6
15. One batter has an avg or 300 and another has an avg of 200. What is the likelihood that both of them will get a hit in the same inning? HINT: 300 IS 300/1000. 1/4???
16. There are 3 football games in the area this weekend. Al involving evenly matched teams. What chance have you to predict all three winners. 1/27
PLease help