How to solve probability using a 2-way or contingency table, venn diagram, and tree diagram

This statistics lesson shows you how to answer probability questions using different methods: two-way table, Venn diagram, and tree diagram. Answering probability question is easier if you can visualize the problem better. These methods will help you answer probability questions if you can illustrate the experiment using any of the visuals.

1:20 Probability given a 2 way table gender vs ear piercing
5:02 solving probability by showing venn diagram
9:54 Answering probability with an aid of a tree diagram

[noahzuijderwijk]

For question b, you said that we have to subtract the percentage of people reading both newspapers but the question asks for then probability of people reading at least 1, does that not also include the people reading both as they do read at least 1? So, should it not be 0.25+0.40+0.05= 0.70, which is 70%?