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Topic: [ap-stat] RE: Probability Help
Replies: 0

 Pat ballew Posts: 455 Registered: 12/3/04
[ap-stat] RE: Probability Help
Posted: Nov 15, 2004 10:45 AM

Amber,
I would find the probability that none of the first three worked, and with
that information, you know the answer to the question you seek.

One of the rhythms of proability students need to pick up is that NOT NONE
is the same as AT LEAST ONE.

Pat Ballew
Lakenheath, UK

MathWords <a href="http://www.pballew.net/etyindex.html">http://www.pballew.net/etyindex.html</a>
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_____

From: Kandravy, Amber [<a href="mailto://Amber.Kandravy@fortbend.k12.tx.us]">mailto://Amber.Kandravy@fortbend.k12.tx.us]</a>
Sent: Monday, November 15, 2004 3:28 PM
To: for Teachers of AP Statistics
Subject: [ap-stat] Probability Help

Hello everyone,

I am working on a problem and I am stumped to find the answer.

The problem is this: There are a dozen old batteries in a junk box. 5 of
which are totally dead, but you don't know which ones specifically. You
start picking them one at at time and testing them. We are asked to find the
probabilty that at least one of the first three works.

Amber Kandravy
Statistics/Algebra Teacher
George Bush High School
281-234-6060

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