Homework Help: Algebra 1

Posted by Zach on Thursday, November 12, 2009 at 9:25pm.

On a multiple choice test with 10 questions and 5 choices, A,B,C,D,E, for each questions, what are the odds of guessing on all 10 questions and getting 100%. State your answer as a common fraction.
Thanks
-Zach

Algebra 1 - Reiny, Thursday, November 12, 2009 at 9:33pm
the prob of getting all 5 correct is
(1/10)*(1/10)*(1/10)*(1/10)*(1/10)
= (1/10)^5 or
= 1/100,000
so the prob of NOT getting all 5 correct
= 1 - 1/100,000 = 99999/100,000

so the odds in favour of getting all 5 correct is
1 : 99,999
Algebra 1 - Zach, Thursday, November 12, 2009 at 9:36pm
Thanks
And I think you answered my question last time i posted, so thanks for keep on rollin'
:)
Algebra 1 - Reiny, Thursday, November 12, 2009 at 10:07pm
welcome!

Answer this Question

Related Questions

Stats - An instructor gives a test with 20 multiple choice questions. There are ...
Math - Given a multiple choice test with 4 choices for each question and 17 ...
math - A multiple-choice test has 10 questions. Each question has 5 choices. If ...
math - Part A of your history test has 15 multiple choice questions. Each ...
math-Probablity - A student is writing a multiple choice test consisting of 40 ...
Stats - A test has 15 true or false questions and 10 multiple choice questions (...
Algebra - A test consist of 15 multiple choice questions, 12 true-false ...
psychology statistics for behavioral sciences - A multiple-choice test has 48 ...
statistic - A multiple-choice test has 48 questions, each with four response ...
Maths - Multiple-choice questions in a test are graded by adding 2 marks for ...

For Further Reading

First Name:
School Subject:
Answer: