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
October 12th, 2013, 05:01 AM   #1
Senior Member
 
Joined: Oct 2009

Posts: 895
Thanks: 1

probability could please check my answer ?

Hi

An urn contains 6 red balls, 2 Green balls, 1 blue ball and 1 white ball. If a ball is drawn,
find the probability of getting a red or white ball.

My answer is
[color=#0040FF]
the total of balls are 10 so we can drawn that in 10C1 = 10 ways

now probability of getting a red = 6C1 = 6
probability of getting a white = 1C1 = 1

required probability 6 X 1 / 10 = 0.6 [/color]

Is my answer correct?
r-soy is offline  
 
October 12th, 2013, 05:20 AM   #2
Senior Member
 
MarkFL's Avatar
 
Joined: Jul 2010
From: St. Augustine, FL., U.S.A.'s oldest city

Posts: 12,211
Thanks: 521

Math Focus: Calculus/ODEs
Re: probability could please check my answer ?

Since it is an OR, you want to add rather than multiply...
MarkFL is offline  
October 12th, 2013, 05:24 AM   #3
Senior Member
 
Joined: Oct 2009

Posts: 895
Thanks: 1

Re: probability could please check my answer ?

Thanks, I got it.
r-soy is offline  
October 14th, 2013, 04:18 AM   #4
Senior Member
 
Joined: Oct 2013
From: Sydney Australia

Posts: 126
Thanks: 0

Re: probability could please check my answer ?

Mark is right.

Try to think about it logically.
The combination formula is often very useful but it cannot replace basic understanding.

P(event) = number of favourable events / total number of possible events

number of favourable events is 7 because there are 7 balls that are red or white.
Total number of events is 10 because there are 10 balls.
Therefore

P(red or white) = 7/10
Melody2 is offline  
Reply

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

Tags
answer, check, probability



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
probability could please check answer(2) r-soy Probability and Statistics 1 October 12th, 2013 11:57 AM
Check my answer please - conditional probability (bayes) OriaG Probability and Statistics 1 April 6th, 2013 11:27 AM
Probability questions.. Check my answer for me. shin777 Probability and Statistics 2 December 15th, 2011 04:31 PM
I want check my answer r-soy Algebra 3 December 22nd, 2009 12:44 PM
Please check if my answer is right. packerfan128 Calculus 1 December 11th, 2008 04:16 PM





Copyright © 2019 My Math Forum. All rights reserved.