My Math Forum  

Go Back   My Math Forum > College Math Forum > Advanced Statistics

Advanced Statistics Advanced Probability and Statistics Math Forum


Reply
 
LinkBack Thread Tools Display Modes
December 23rd, 2009, 02:28 AM   #1
Newbie
 
Joined: Dec 2009

Posts: 2
Thanks: 0

Hyp distribution question

A tutor is checking a practicant's work (declarations) and chooses 3 out of 12 declarations. There are 2 faulty ones.
N=12, n=3 S=2

P(X=0) = 12/22 P(X=1) = 9/22 P(X=2) = 1/22

E(X)=0.5
V(X)=15/44

How many declarations must the tutor check, in order for his probability to find at least one faulty declaration to be at least 2/3?
Btw, answer in book says n>=5, any help?
allan89a is offline  
 
December 23rd, 2009, 02:10 PM   #2
Senior Member
 
Joined: Dec 2009
From: Las Vegas

Posts: 209
Thanks: 0

Re: Hyp distribution question

Hi;

The book is right. For five picks we can get 2 wrong 3 right or 1 wrong 4 right.

bobbym is offline  
Reply

  My Math Forum > College Math Forum > Advanced Statistics

Tags
distribution, hyp, question



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
A question concerning the distribution law... anakhronizein Applied Math 3 January 16th, 2014 04:04 PM
Is this a distribution question? mathman Algebra 0 May 18th, 2012 02:25 PM
Distribution question Aikion Algebra 0 April 20th, 2012 08:46 AM
uniform distribution question 450081592 Advanced Statistics 3 November 9th, 2011 02:35 PM
question on distribution sneaky Algebra 0 October 21st, 2010 11:39 AM





Copyright © 2019 My Math Forum. All rights reserved.