Posted by Zach on .
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,
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,
Thanks
And I think you answered my question last time i posted, so thanks for keep on rollin'
:) 
Algebra 1 
Reiny,
welcome!