Friday

March 6, 2015

March 6, 2015

Posted by **tanya** on Saturday, December 4, 2010 at 11:16pm.

only one of each 5 answers is correct.

If student randomly guesses on all six questions,

what is the probability to answer 2 questions right?

Tip: first, you have to define parameters of Binomial distribution:

n - how many trials/questions do you have

p - probability guessing right answer to each question

x - how many successes do you expect.

Then use Appendix Table or Excel function for Binomial distribution.

Answer

- statistic -
**MathMate**, Sunday, December 5, 2010 at 8:54amAssuming the 6 questions are independent,

n=6 (questions)

p=probability of guessing the right answer (1/5)

x=*exactly*the number of successes over the 6 questions (2).

Look up the appendix table, or the Excel function to calculate the probability.

Alternatively, use the formula:

P(x) = C(n,x)*p^{x}*(1-p)^{n-x}

Where C(n,x) represents the number of combinations of taking n things, x at a time.

- statistic -
**Mare**, Tuesday, October 25, 2011 at 11:48am.8

- statistic -
**Anonymous**, Wednesday, October 17, 2012 at 1:39pmon a test midterm exam each multiple choice question provides five possible answers. what is the probability of randomly guessing three consecutive questions correctly?

- statistic -
**Anonymous**, Tuesday, May 28, 2013 at 7:09pm.324

**Answer this Question**

**Related Questions**

statistic and probability - There are two independent multiple-choice quizzes ...

Statistic - There are two independent multiple-choice quizzes where quiz 1 has ...

Math - 10 multiple choice questions each with three possible answers only one of...

stat probability - A multiple choice quiz consists of 20 questions, each with 3 ...

statistics - A multiple choice test has 20 questions with each having 4 possible...

Binomial Distribution - A biology quiz consists of twelve multiple-choice ...

advanced statistics - suppose a student takes a multiple choice test with 10 ...

Statistics - Richard has been given a 5-question multiple-choice quiz in his ...

stats - a student randomly guesses at five multiple-choice questions, each ...

LBCC - A multiple choice quiz consists of 20 questions, each with 3 possible ...