My Math Forum Expected Value & Probability

 Probability and Statistics Basic Probability and Statistics Math Forum

 February 2nd, 2010, 07:37 AM #1 Newbie   Joined: Jan 2010 Posts: 6 Thanks: 0 Expected Value & Probability I have a 4-question 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 correct--could 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 Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post maevious pacha Advanced Statistics 0 February 26th, 2014 09:40 AM adasko99 Probability and Statistics 3 October 31st, 2013 02:44 AM ayaya815 Advanced Statistics 2 November 3rd, 2009 05:38 PM jbenloulou Advanced Statistics 3 June 26th, 2009 06:09 AM jd254 Algebra 0 May 7th, 2009 12:46 AM

 Contact - Home - Forums - Cryptocurrency Forum - Top