Monday

September 1, 2014

September 1, 2014

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

please help me i am confused

- math -
**Reiny**, Wednesday, April 21, 2010 at 4:52pmright = 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 4:54pmthat 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 -...

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...

Statistics - Over time, a student analyzes her ability to guess correctly after ...

English for john browm - Let me give you something on "multiple-choice" items ...

Math - A multiple choice quiz contains five question. Each question has four ...

Probability - Mary took a 20 question multiple-choice exam where there are 4 ...

stats - You took a 5-question multiple choice quiz with 4 choices for each ...