
Probability and Statistics Basic Probability and Statistics Math Forum 
 LinkBack  Thread Tools  Display Modes 
June 10th, 2015, 03:14 PM  #1 
Newbie Joined: Jun 2015 From: Kiribati Posts: 5 Thanks: 0 Math Focus: Statistics  Expected Total value
Could anyone check my working out Two coins are selected t random from a wallet containing four 5 cent pieces, one 10 cent piece, three 20 cent pieces and two 50 cent pieces. What is the expected total value of the two coins? expected value = mean = ∑(x).P(x) But before using the formula you should created your Probability distribution table: cents 5c 10c 20c 50c Probability distribution table value of x 4 1 3 2 then X 1 2 3 4 P(x=x) 2/5 1/10 3/10 1/5 P(X=x) 0.1 0.2 0.3 0.4 By using the formula(∑(x).P(x)) all x values are multiplied by its probability and then add them together. = 3 I dont know if I do the right thing because and if I do some mistakes I would like to learn from it. 
June 10th, 2015, 05:21 PM  #2  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Hello, sensational! Quote:
 

Tags 
expected, total 
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 
Total Probability  marks2014  Probability and Statistics  3  April 30th, 2014 12:23 PM 
Total Area  mared  Geometry  3  April 4th, 2014 09:53 AM 
total variation  branny12000  Advanced Statistics  0  May 28th, 2013 04:37 AM 
total derivative  reemas  Calculus  3  October 22nd, 2011 07:21 PM 
Total distance  MathematicallyObtuse  Algebra  3  February 8th, 2011 01:41 AM 