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In a Statistics Test, there are 10 multiple choice questions each with 3 possible answers.
Find the probability that a student get 8 correct questions by guessing
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It is a binomial distribution probability problem.
The number of trials n= 10; the number of success trials k= 8;
the probability of successful individual trial (right guess) is p= 1/3.
Use the standard binomial formula for the probability
P = = = 0.003048316. ANSWER
Solved, with explanations.
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To see many other similar (and different) solved problems, look into the lessons
- Simple and simplest probability problems on Binomial distribution
- Typical binomial distribution probability problems
in this site.