My Math Forum  

Go Back   My Math Forum > High School Math Forum > Probability and Statistics

Probability and Statistics Basic Probability and Statistics Math Forum


Reply
 
LinkBack Thread Tools Display Modes
April 22nd, 2011, 08:55 AM   #1
Newbie
 
Joined: Aug 2009

Posts: 29
Thanks: 0

Joint Probability Distribution question

Hello guys, I wanna ask a few questions regarding Probability and Statistics here. I really have no idea how to solve it. Can someone point to me and give me some ideas how to solve this kind of question? I know this is not a place to do-your-homework but I really need some help here. Just tell me what to use and I'll try to solve it by myself.

Quote:
2 textbooks are selected at random from a shelf that contains 3 statistics texts, 2 mathematics texts and 3 physics texts. If X is the number of statistics texts and Y is the number of mathematics texts actually chosen.

a) construct a joint probability distribution table for X and Y
b) find the expected number of statistics text actually chosen
c) determine whether X and Y are independent
This one, I really had no idea to solve it. It has 3 different textbooks but only choose 2 which is statistics and mathematics.

Enlighten me through this please
The possibilities can be set up in a table as follows:
X.....Y
0.....0
1.....0
2.....0
0.....1
1.....1
2.....0

Consider in each case how many ways it could happen. For example, X=0 and Y=0 means there are 3 (out of eight) ways the first book could be physics and 2 (out of 7) ways the second book could be physics. Therefore this covers 6 out of 56 ways.
xdeathcorex is offline  
 
Reply

  My Math Forum > High School Math Forum > Probability and Statistics

Tags
distribution, joint, probability, question



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Joint Distribution help please batman350z Advanced Statistics 3 April 23rd, 2012 03:50 PM
Find the joint distribution of U1, U2 450081592 Advanced Statistics 0 January 24th, 2012 08:44 PM
Stochastic processes - joint distribution allandmunja Advanced Statistics 1 April 4th, 2011 02:05 PM
joint distribution question sletcher Calculus 18 December 15th, 2010 12:51 PM
Joint probability distribution of random variables meph1st0pheles Advanced Statistics 1 March 23rd, 2010 06:47 PM





Copyright © 2019 My Math Forum. All rights reserved.