Thursday

July 31, 2014

July 31, 2014

Posted by **Jen** on Wednesday, July 20, 2011 at 3:38pm.

- Math -
**bobpursley**, Wednesday, July 20, 2011 at 3:45pmexpected value of random choice: 1/5*5 + 4/5*(-2)=1-8/5

expected value of skipping, no answer: 0

so, skip it.

Now what if you could eliminate just one silly wrong answer?

expected value of guessing: 1/4*5-2(3/4)= 1.25-6/4=1.25-1.50=-.25

what if you could eliminate two silly answers....

expected value guessing=1/3*5 -2(2/3)= 5/3-4/3=.3333.

so, if you can't eliminate at least two answers, dont guess on this test. Normally on multiple choice, it is pretty easy to eliminate two answers.

- Math -
**Jen**, Thursday, July 21, 2011 at 7:48amoh okay...so confusing...thank you.

**Related Questions**

Math - In a multiple-choice test, each question has five options. Students will ...

Math-probability - In a multiple-choice test, each question has five options. ...

math help - I need help solving this math problem, please: Problem: Angela's ...

Math - I need help solving this math problem, please: Problem: Angela's math ...

elem alg - On a certain test, the student gets 3 points for each correct answer ...

math help - Use the following table to answer the questions. (Give your answers ...

math - Can someone please help me on these I have look at the examples and done ...

Math - Kosuke wrote a mathematics contest consistingof 25 multiple choice ...

Math - Given a multiple choice test with 4 choices for each question and 17 ...

Algebra word problem - There are 50 questions to answer in a triva contest. Each...