Posted by **Jamal** on Tuesday, April 22, 2008 at 4:51pm.

What is the probability of guessing 70 out of 100 multiple choice questions correct when there are 4 choices per question?

- math -
**Reiny**, Tuesday, April 22, 2008 at 6:05pm
prob of being right is 1/4

prob of guessing wrong is 3/4

so prob of guessing 70 out of 100 correct is

C(100,70)*(1/4)^70*(3/4)^30

= 3.763*10^-21

we are dealing with very large and very small numbers here, and I had to "trust" my calculator.

## Answer This Question

## Related Questions

- math - A multiple-choice test has 10 questions. Each question has 5 choices. If ...
- psychology statistics for behavioral sciences - A multiple-choice test has 48 ...
- statistic - A multiple-choice test has 48 questions, each with four response ...
- Stats - An instructor gives a test with 20 multiple choice questions. There are ...
- Probability - Mary took a 20 question multiple-choice exam where there are 4 ...
- Statistics - A multiple choice test has five choices. Therefore the probability ...
- Math - A multiple choice quiz contains five question. Each question has four ...
- statistic and probability - There are two independent multiple-choice quizzes ...
- Statistics - On a very short quiz, there is one multiple choice question with 5 ...
- Algebra 1 - On a multiple choice test with 10 questions and 5 choices, A,B,C,D,E...

More Related Questions