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
February 25th, 2010, 11:01 PM   #1
Newbie
 
Joined: Feb 2010

Posts: 1
Thanks: 0

Statistics Normal Distribution Question

Hi Everyone! I need help with a statistics problem:
Lori just bought a set of four tires for her car. The life of each tire is normally distributed with a mean of 45,000 miles and a standard deviation of 2000 miles. Find the probability that all four tires will last at least 46,000 miles. Assume that the life of each tire is independent of the lives of other tires.

So I tried solving this, but I got stuck with the idea of the probability for all four tires.

Am I supposed to multiply the z number of one tire by four??

Thanks.
idancerobotical is offline  
 
February 26th, 2010, 07:23 PM   #2
Senior Member
 
Joined: Aug 2008
From: Blacksburg VA USA

Posts: 346
Thanks: 6

Math Focus: primes of course
Re: Statistics Normal Distribution Question

well, I would ask you a few questions - do you know how the "independent" caveat plays into things, and if so, what approx answer would you xpect if the question posed were for 45000 ie the meanline? Would you say odds are High or low? Or, is it easier to think of 4 playing cards randomly selected from 52 each time, what are odds all 4 cards are value 8 or higher (Ace high)?
billymac00 is offline  
Reply

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

Tags
distribution, normal, question, statistics



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Statistics (Normal distribution) help. Xpat Probability and Statistics 1 January 31st, 2012 08:25 PM
statistics problem on normal distribution?? srw840 Advanced Statistics 0 November 10th, 2011 03:34 PM
statistics problem on normal distribution? srw840 Advanced Statistics 0 November 10th, 2011 02:27 PM
Normal Distribution Question SteveBIRK Algebra 1 December 7th, 2009 07:46 PM
Question on PDF of normal distribution aurum Advanced Statistics 1 October 24th, 2007 12:02 PM





Copyright © 2019 My Math Forum. All rights reserved.