DISCRETE PROBABILITY (Chs14, 15,16)
Here is an excellent video which gives questions about Tree Diagrams. Pause the video and try to solve it before you watch the rest.


Here is an excellent Binomial probability distribution problem. Solve the problem and then go to the links below for the videos which explain the solution.
LINKS FOR SOLUTION
http://www.examsolutions.net/alevelmathspapers/workedsolution/workedsolution.php?paper_id=706&solution=3.1
http://www.examsolutions.net/alevelmathspapers/workedsolution/workedsolution.php?paper_id=706&solution=3.2
http://www.examsolutions.net/alevelmathspapers/workedsolution/workedsolution.php?paper_id=706&solution=3.3
http://www.examsolutions.net/alevelmathspapers/workedsolution/workedsolution.php?paper_id=706&solution=3.1
http://www.examsolutions.net/alevelmathspapers/workedsolution/workedsolution.php?paper_id=706&solution=3.2
http://www.examsolutions.net/alevelmathspapers/workedsolution/workedsolution.php?paper_id=706&solution=3.3