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March 27, 2015

March 27, 2015

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.

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