My Math Forum  

Go Back   My Math Forum > High School Math Forum > Probability and Statistics

Probability and Statistics Basic Probability and Statistics Math Forum


Reply
 
LinkBack Thread Tools Display Modes
April 19th, 2011, 11:51 PM   #1
Senior Member
 
Joined: Dec 2010

Posts: 233
Thanks: 0

Probability(hard question)

Today my teacher gave us a topical test on probability.this is one of the question.

In a box containing 20 red apples and 5 green apples,3 of the red apples are rotten and one of the green apples is rotten.Two apples are randomly selected from the box.Calculate the probability that

a)both the apples are rotten
b)both are red and at least one of them is rotten
c)at least one is rotten if both are red
d)both are red if it is found that at least one is rotten

I construct a tree diagram for this question.i think i am wrong,right?i am confuse about this question.Please help me to solve step by step and explain to me about the concept.Thank you.
hoyy1kolko is offline  
 
April 20th, 2011, 05:04 AM   #2
Math Team
 
Joined: Dec 2006
From: Lexington, MA

Posts: 3,267
Thanks: 407

Re: Probability(hard question)

Hello, hoyy1kolko!

Quote:
In a box containing 20 red apples and 5 green apples, 3 of the red apples are rotten and one of the green apples is rotten.
Two apples are randomly selected from the box.




Quote:
Calculate the probability that:

a) both the apples are rotten







Quote:
b) both are red and at least one of them is rotten











Quote:
c) at least one is rotten if both are red













Quote:
d) both are red if it is found that at least one is rotten







[color=beige]. . [/color]
[color=beige]. . [/color]




soroban is offline  
April 21st, 2011, 07:04 AM   #3
Senior Member
 
Joined: Dec 2010

Posts: 233
Thanks: 0

Re: Probability(hard question)

Thank you so much sir,yr explanation is excellent and easy to understand.
hoyy1kolko is offline  
Reply

  My Math Forum > High School Math Forum > Probability and Statistics

Tags
probabilityhard, question



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
hard question of probability vitoriogauss Probability and Statistics 1 June 14th, 2013 12:43 PM
A hard construction question in probability hewuxingkong Advanced Statistics 1 October 12th, 2012 12:10 AM
Probability question (hard and confusing) hoyy1kolko Probability and Statistics 9 May 18th, 2011 08:49 AM
Probability question(hard) hoyy1kolko Probability and Statistics 5 April 8th, 2011 06:12 PM
Probability question....quite hard. bigben Advanced Statistics 9 June 6th, 2007 05:32 AM





Copyright © 2017 My Math Forum. All rights reserved.