Posted by **Katherine** on Wednesday, April 21, 2010 at 4:50pm.

you take a three-question multiple-choice test.each question has four choices.you dont know any of the answers. what is the experimental probability that you will guess exactly two out of three correctly

please help me i am confused

- math -
**Reiny**, Wednesday, April 21, 2010 at 4:52pm
right = r

wrong = w

so you want

rrw

rwr

wrr

each of the above has a prob of 1/4 x 1/4 x 3/4 = 3/16

so the prob of getting 2 out of 3 correct is 3(3/16) = 9/16

- correction - maths -
**Reiny**, Wednesday, April 21, 2010 at 4:54pm
that should have said:

each of the above has a prob of 1/4 x 1/4 x 3/4 = 3/64

so the prob of getting 2 out of 3 correct is 3(3/64) = 9/64

## Answer this Question

## Related Questions

- math - you take a three-question multiple-choice test.each question has four ...
- prealgbra - solve by simulating the problem.you have a 5 -question multiple -...
- Statistics - Over time, a student analyzes her ability to guess correctly after ...
- Math - On a multiple choice test you guess he answers to two questions. Each ...
- Math - On a multiple-choice test you randomly guess the answers to two questions...
- Statistics - You have a ten question multiple choice test in your next class and...
- Math - A multiple choice quiz contains five question. Each question has four ...
- English for john browm - Let me give you something on "multiple-choice" items ...
- math - Beth Dahlke is taking a ten question multiple choice test for which each ...
- math - Beth Dahlke is taking a ten question multiple choice test for which each ...