## ← Conditional Probability 2 Solution - Applied Cryptography

• 3 Followers
• 10 Lines

### Get Embed Code x Embed video Use the following code to embed this video. See our usage guide for more details on embedding. Paste this in your document somewhere (closest to the closing body tag is preferable): ```<script type="text/javascript" src='https://amara.org/embedder-iframe'></script> ``` Paste this inside your HTML body, where you want to include the widget: ```<div class="amara-embed" data-url="http://www.youtube.com/watch?v=xIyuSp6gD38" data-team="udacity"></div> ``` 1 Language

Showing Revision 3 created 05/25/2016 by Udacity Robot.

1. [Narrator] The answer is 0.34.
2. To compute this, we need to use the conditional probability rule.
3. We already know the probability of B, which is X is a vowel.
4. We computed that in question 1 as 0.38.
5. What we need is the probability of A intersect B.
6. Well, B is--the events were X is a vowel.
7. A are the events where is equal to E.
8. Whenever X is equal is to E, it's also a vowel.
9. That intersection probability is the same as the probability that X is equal to E,
10. which is 0.13, and dividing those we get the result 0.34.