
Probability and Statistics Basic Probability and Statistics Math Forum 
 LinkBack  Thread Tools  Display Modes 
December 22nd, 2018, 09:29 AM  #1 
Member Joined: Apr 2017 From: India Posts: 48 Thanks: 0  Probability and statistics
If 3 books are selected at random from a shelf containing 5 Novels, 3 Books of poems and a dictionary, what is the probability that a) dictionary is not selected b) 2 Novels and 1 Book of poems are selected I tried doing it, however I am unable to guess what will go in the denominator part of the answer. Can someone please help me solve this question? 
December 22nd, 2018, 09:47 AM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,370 Thanks: 1274 
of the 9 books only 1 is a dictionary so P[not selecting dictionary] = 8/9 there are 5 novels from the 9, we select one, now there are 4 novels of 8 and we select another one, now there are 3 poems of 7, and we select one. P[2 novels and 1 poems] = 5/9 4/8 3/7 = 60/504 
December 23rd, 2018, 10:40 AM  #3  
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,112 Thanks: 1002  Quote:
3 poems from the 9: 3/9 4 novels from the 8: 4/8 5 novels from the 7: 5/7 3/9 * 4/8 * 5/7 = 60/504 = 5/52 Thanks Romsek: yo my probability teacher!!  

Tags 
probability, statistics 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
ProbabilityStatistics  superblack  Probability and Statistics  5  March 25th, 2014 12:31 PM 
Probability and Statistics help???  kylerwoods  Probability and Statistics  1  May 21st, 2010 04:34 AM 
probability and statistics help!  xoanonymous  Probability and Statistics  1  May 9th, 2009 04:45 PM 
Statistics/Probability  symmetry  Advanced Statistics  1  June 18th, 2007 05:34 PM 
help with probability ans statistics  katielangford1  Advanced Statistics  0  December 31st, 1969 04:00 PM 