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January 31, 2015

January 31, 2015

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

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 7:19amSorry 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 6:56pmWhat is the probability that at least one of the three people has alzheimer's diseas

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