BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Probability

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 2
Joined: Wed May 26, 2010 9:53 am

Probability

by neetusanjay » Mon Jul 29, 2013 4:03 pm
Need help with below questions..

1.
Smalltown Elevator produces elevator rails. To meet specifications, an elevator rail must be between 0.995 inches and 1.005 inches in diameter. Suppose that the diameter of an elevator rail follows a normal random variable with mean of 1 inch and standard deviation of 0.003 inches. Rounded to the nearest one tenth of one percent, what fraction of all elevator rails will meet specifications?

90.4%
95.2%
93.4%
97.3%
None of the above
Last edited by neetusanjay on Wed Jul 31, 2013 6:20 pm, edited 1 time in total.
Top
Source: — Problem Solving |
User avatar
MBA Admissions Consultant
Posts: 2279
Joined: Fri Nov 11, 2011 7:51 am
Location: New York
Thanked: 660 times
Followed by:266 members
GMAT Score:770

by Jim@StratusPrep » Wed Jul 31, 2013 10:09 am
would you mind breaking these up into different posts?
GMAT Answers provides a world class adaptive learning platform.
-- Push button course navigation to simplify planning
-- Daily assignments to fit your exam timeline
-- Organized review that is tailored based on your abiility
-- 1,000s of unique GMAT questions
-- 100s of handwritten 'digital flip books' for OG questions
-- 100% Free Trial and less than $20 per month after.
-- Free GMAT Quantitative Review

Image
Top

GMAT/MBA Expert

User avatar
Elite Legendary Member
Posts: 10392
Joined: Sun Jun 23, 2013 6:38 pm
Location: Palo Alto, CA
Thanked: 2867 times
Followed by:511 members
GMAT Score:800

by [email protected] » Wed Jul 31, 2013 12:08 pm
Hi neetusanjay,

These don't appear to be GMAT questions. If you're studying for the GMAT, then you won't see questions of this type.

GMAT assassins aren't born, they're made,
Rich
Contact Rich at [email protected]
Image
Top
GMAT Instructor
Posts: 2630
Joined: Wed Sep 12, 2012 3:32 pm
Location: East Bay all the way
Thanked: 625 times
Followed by:119 members
GMAT Score:780

by Matt@VeritasPrep » Wed Jul 31, 2013 3:44 pm
If if I remember my stats (it's been about eight years, so I'm not sure I'm right about any of these):

The first one is A (90.4%)
The second one is C (4.77%)
The third one is unclear - by number does the question mean "integer" or "real number"? Assuming this is for a continuous uniform distribution, you have f(x) = 1/(b-a) = 1/(100-0) = 1/100, or A (1%)

These are not even remotely GMAT questions, however.
Top
Newbie | Next Rank: 10 Posts
Posts: 2
Joined: Wed May 26, 2010 9:53 am

by neetusanjay » Wed Jul 31, 2013 6:02 pm
Thank you Matt. Really appreciate your response.
Top
Post new topic Post Reply
• Page 1 of 1