
Probability and Statistics Basic Probability and Statistics Math Forum 
 LinkBack  Thread Tools  Display Modes 
February 2nd, 2010, 07:37 AM  #1 
Newbie Joined: Jan 2010 Posts: 6 Thanks: 0  Expected Value & Probability
I have a 4question worksheet and I think I have them all correct except for one: 1) A sorority sold 65 tickets in a raffle for a $480 TV set. What is the expected value of a single ticket if only one ticket wins?  I'm stumped. The other 4 questions I believe are correctcould someone confirm? 2) A box contains 4 blue cards and 3 red cards. If 2 cards are drawn one at a time, find the probability that both are red with replacement and without replacement.  9/49 with replacement  1/7 without replacement 3) Two dice are rolled. What are the odds against rolling a sum of 4 or 11?  31/5 4) In a NASA rocket firing, the probability of success of the 1st stage=70%, 2nd stage=56%, and 3rd stage=80%. What is the probability for success fir the three stage rocket?  (70/100) x (56/100) x (80/100) = 196/625 Thank You! 
February 2nd, 2010, 12:19 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,835 Thanks: 733  Re: Expected Value & Probability
For 1 hint: Buy all the tickets, how much should each ticket cost to break even? 2 and 4 are correct. 3 looks like a typo (31/5 ???) 

Tags 
expected, probability 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Expected value  maevious pacha  Advanced Statistics  0  February 26th, 2014 09:40 AM 
probability/chances/expected value/variance question :)  adasko99  Probability and Statistics  3  October 31st, 2013 02:44 AM 
[help] question about expected value and probability  ayaya815  Advanced Statistics  2  November 3rd, 2009 05:38 PM 
Expected Probability  jbenloulou  Advanced Statistics  3  June 26th, 2009 06:09 AM 
find expected value, standard deviation, and probability  jd254  Algebra  0  May 7th, 2009 12:46 AM 