Monday

July 28, 2014

July 28, 2014

Posted by **Taymor** on Thursday, April 9, 2009 at 11:41pm.

What is the probability of at least 6 correct answers?

I know this a Burnoulli Trial problem and that N=8 and p=.5 and q=.5

I just don't know where to go from there.

- College Finite Math -
**drwls**, Friday, April 10, 2009 at 12:19amAdd the probabilities of 6, 7 and 8 correct answers. The probability of getting all 8 right is (1/2)^8 = 1/256

The probability of getting 6 right is (1/2)^8*8!/[6!*2!] = 56/[256*2] = 28/256

The probability of getting 7 right is

(1/2)^8*8!/[7!*1!]= 8/256

The total probability is 37/256

**Related Questions**

statistics - Rework problem 15 from section 3.5 of your text involving a true-...

Maths - A true/ false test is given. If a person guesses the answers, the ...

Math - 13. A true or false test has 8 questions. What is the probability of ...

Stats - An instructor gives a test with 20 multiple choice questions. There are ...

psychology statistics for behavioral sciences - A multiple-choice test has 48 ...

math - Mrs. Sue please help! A true-false test has 12 questions. What is the ...

math - a true or false test has 5 questions. what is the probability of guessing...

Probability - Darby guesses the answers to six questions on the math portion of...

statistic - A multiple-choice test has 48 questions, each with four response ...

Probability - Darby guesses the answers to six questions on the math portion of...