Homework Help: Probability

Posted by Student on Sunday, March 4, 2012 at 6:56pm.

Thank you for the explanation MathMate! Would the answer to this question be A?

Darby guesses the answers to six questions on the math portion of her college entrance exam. Each question is a true or false question. What is the approximate probability that at least 4 of her answers are correct?

A. 0.23
B. 0.34
C. 0.66
D. 0.78

Probability - MathMate, Monday, March 5, 2012 at 7:19am
Sorry that the previous response was for 4 correct.
The number ways to have at least 4 correct is
(6,4)+(6,5)+(6,6)
=15+6+1
=22
To total number of ways to respond is
2^6=64
So the probability is 22/64.
Probability - Anonymous, Monday, April 23, 2012 at 6:56pm
What is the probability that at least one of the three people has alzheimer's diseas

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