Is my Venn diagram for probability of event B correct?

  • Thread starter Thread starter tzx9633
  • Start date Start date
  • Tags Tags
    Confusion Diagram
Click For Summary
SUMMARY

The discussion centers on the correct representation of the probability of event B using a Venn diagram, given mutually exclusive and exhaustive events A1, A2, ..., An. The formula P(B) = P(A1) x P(B | A1) + P(A2) x P(B | A2) + ... + P(An) x P(B | An) is confirmed to be accurate under the condition that B is a subset of the union of the Ai events. Participants emphasize the importance of ensuring that the region outside the blue circles in the Venn diagram does not include event B, as this would invalidate the representation.

PREREQUISITES
  • Understanding of probability theory, specifically conditional probability.
  • Familiarity with the concepts of mutually exclusive and exhaustive events.
  • Knowledge of Venn diagrams and their application in probability.
  • Ability to interpret mathematical notation related to probabilities.
NEXT STEPS
  • Study the concept of conditional probability in depth, focusing on its applications.
  • Learn how to construct and interpret Venn diagrams for complex probability scenarios.
  • Explore the law of total probability and its implications in various contexts.
  • Review examples of mutually exclusive and exhaustive events in real-world situations.
USEFUL FOR

Students studying probability, educators teaching probability concepts, and anyone involved in statistical analysis or data science requiring a solid understanding of event relationships.

tzx9633

Homework Statement


It's given that the total probability of event b =P(B)

If A1 , A2 ... An are mutually exclusive and exhaustive events , then probability of B =



Homework Equations

The Attempt at a Solution


P(B) = P(A1) x P(B | A1) + P(A2) x P(B | A2) + P(A3) x P(B | A3) + ... P(An) x P(B | An)

IS it correct if i represent them in this Venn's diagram ?
 

Attachments

  • 691.png
    691.png
    4.1 KB · Views: 548
Physics news on Phys.org
tzx9633 said:
IS it correct if i represent them in this Venn's diagram ?
That depends. Is the region not included in any of the blue circles one of the Ai?
 
  • Like
Likes   Reactions: Ray Vickson
tzx9633 said:

Homework Statement


It's given that the total probability of event b =P(B)

If A1 , A2 ... An are mutually exclusive and exhaustive events , then probability of B =



Homework Equations

The Attempt at a Solution


P(B) = P(A1) x P(B | A1) + P(A2) x P(B | A2) + P(A3) x P(B | A3) + ... P(An) x P(B | An)

IS it correct if i represent them in this Venn's diagram ?

The statement ##P(B) = \sum_{i=1}^n P(A_i) P(B|A_i)## is correct ONLY if ##B \subset \cup_{i=1}^n A_i##. In your case you said the ##\{ A_i \}## are mutually exclusive and exhaustive (meaning that ##\cup_{i=1}^n A_i## is the whole sample space), so the equation is correct. I guess you are asking if your Venn diagram is also correct. Well, do you have ##B \subset \cup_{i=1}^n A_i## in your diagram?
 

Similar threads

  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 8 ·
Replies
8
Views
5K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
3
Views
3K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 3 ·
Replies
3
Views
8K