14. The ordering is important and the cards are not put back in the deck, both these facts influence the probabilities.
P(blue, then blue) = 6/22 * 5/21 = 30/462 = 5/77. First there were 6 blue cards out of 22, then only 5 out of 21.
15. Same principle applies 12/22 * 4/21 = 8/77
16. 10% is not that much, you'll be fine
17. For sure he will come into the room
18. More than half of the time you miss it.
19. 3 days per school week. That's more than half.
20. It will not rain.
21. P(3) = 7/30, read from the graph that there were 7 occurrances.