Posted by HM on Wednesday, November 9, 2011 at 4:18am.
An unprepared student makes random guesses for the ten truefalse questions on a quiz. Find the probability that there is at least one correct answer.
Could some one please help me?
And explain to me how they got the answer?
and is there another way besides the tree method?

PROBABILITY MATH  Reiny, Wednesday, November 9, 2011 at 8:08am
All we have to exclude is the case when he guessed all of them wrong
that prob would be (1/2)^10 = 1/1024
so the prob of getting at least one correct is 1  1/1024 = 1023/1024

PROBABILITY MATH  ebony, Monday, May 14, 2012 at 12:28am
Take 10/2=5
possibility of 5 right or 5 wrong because there is only two possible outcomes
2/100 = .50 (True and False Outcomes)
There are a total of 10 questions
.50^10 questions = .0009765625 rounded = .0009777
use the complement formula 1P=
1.0009777 = .9990223 that there is at least once correct answer
Answer This Question
Related Questions
 statistics  An unprepared student makes random guesses for the ten truefalse ...
 math  An unprepared student makes random guesses for the ten true or false ...
 STAT  A student takes a tenquestion truefalse quiz, but did not study and ...
 Statistics  Please help. Find the probability of getting 2 hearts if the cards ...
 Statistics  An unprepared student is about to take his first test of the ...
 Math  A student randomly guesses the answers to a four question true or false ...
 Statistics Algebra 2  A 10question multiple choice test has 4 possible answers...
 Math  On a truefalse test, each question has exactly one correct answer: true...
 Math  A multiple  choice quiz contains 5 questions with 4 choices for each ...
 Statistics  On a very short quiz, there is one multiple choice question with 5 ...
More Related Questions