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About Scott A Wilson
Expertise
I can answer any question in algebra, pre-calculus, probability, trigonometry, or statistics.

Experience
Experience in the area; I have tutored people over the years in algebra, basic math, and statistics. I worked at The Boeing Company for over 5 years. Education/Credentials: MS degreee in Mathematics from Oregon State Univeristy; taken well over 100 hours of upper division credits in mathematical courses such as calculus, statistics, probabilty, linear algrebra, powers, linear regression, matrices, and more. I graduated with honors. Past/Present Clients: College Students at OSU, various math people since college, over 700 people in math and calculus.
 
   

You are here:  Experts > Science > Mathematics > Advanced Math > Probability and statisitcs

Topic: Advanced Math



Expert: Scott A Wilson
Date: 5/12/2008
Subject: Probability and statisitcs

Question
On a multiple-choice test of 10 questions, each question has 5 possible answers. A student is certain of the answers to 4 questions but is totally baffled by 6 questions, what is the probability that the student will get a score of 5 or more on the test? Express your answer to two decimal places.

Answer
The chance of getting each question wrong is 4/5.  Take this value to the number of questions he must guess.  This will give the probability of getting only 4 questions right (since it's the probability of getting the remaining questions all wrong).  If he does not get only 4, then he has 5 or more.  The answer is then one minus the probability.

Thanks for the question.  You are welcome to ask me any more as necessary and also rate this answer.

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