Amsco Integrated Algebra I: The Probability of (A or B)
 This is a free lesson from our course in Amsco's Integrated Algebra

 This lesson explains how to find probability for the shared outcome of events A or B i.e. P (A or B). In the case of the shared outcomes of events A and B: (A and B) = n (A Ω B)/ n(S). If two events A and C are mutually exclusive: P(A or C) = P(A) + P(C). If two events A and B are not mutually exclusive: P(A or B) = P(A) + P(B) - P(A and B)  (More text below video...)
People who saw this lesson also found the following lessons useful:
 Combinations Empirical Probability Evaluating Simple Probabilities The Counting Principle, Sample Spaces, and Probability Permutations
 (Continued from above)Each probability is a number between zero (the event will not happen in any trial) and one (the event will surely happen in every trial) and the sum of the probabilities of all possible singleton outcomes for any sample space must always equal 1, i.e. for any event A: P(A) + P(not A) = 1. For example: Examine three events that occur when a die is rolled. Event A= {an even number} = {2, 4, 6}. Event B= {a number less than three} = {1, 2} Event C= {a number less than two} = {1} Since A and C are mutually exclusive: P (A or C) =P (A) +P(C) =3/6+1/6=4/6=2/3. A and B are not mutually exclusive: P(A or B)=P(A)+P(B)-P(A and B)=3/6+2/6-1/6=4/6=2/3..

 As many of you know, Winpossible's online courses use a unique teaching method where an instructor explains the concepts in any given area to you in his/her own voice and handwriting, just like you see your teacher explain things to you on a blackboard in your classroom. This particular lesson includes the teacher's instruction, practice questions as well as end-of-lesson quizzes for practice. As we mentioned above, you can enroll in our online course in Trigonometry by clicking here. The format of Winpossible's online courses is also very suitable for teachers who are using an interactive whiteboard such as Smartboard on Promethean in their classrooms, because the course lessons can be easily displayed on such interactive whiteboards. Volume pricing is available for schools interested in our online courses. For more information, please contact us at educators@winpossible.com.

 Copyright © Winpossible, 2010 - 2011 Best viewed in 1024x768 & IE 5.0 or later version