Thursday

September 18, 2014

September 18, 2014

Posted by **HM** on Wednesday, November 9, 2011 at 4:18am.

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 8:08amAll 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 12:28amTake 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 1-P=

1-.0009777 = .9990223 that there is at least once correct answer

**Answer this Question**

**Related Questions**

math - An unprepared student makes random guesses for the ten true or false ...

Statistics - Please help. Find the probability of getting 2 hearts if the cards ...

Statistics - On a very short quiz, there is one multiple choice question with 5 ...

Math - On a true-false test, each question has exactly one correct answer: true...

statistics - a quiz had 6 questions, each with 4 possible answers (only one of ...

math - 11. A Certification Exam containing 20 true and false questions. If a ...

Math - 10 multiple choice questions each with three possible answers only one of...

Probability/Statistics - A quiz consists of 10 multiple-choice questions, each ...

math (stats) - A biology professor gives a surprise quiz consist of a true/false...

Math/Prob - Claire takes a five-question true-false test. She hasn't studied, so...