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January 25, 2015

January 25, 2015

Posted by **Daniel** on Thursday, March 7, 2013 at 10:20am.

(1) Find the average score of the class.

(2) Find the SD of scores of the class.

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**EDXStudent**, Thursday, March 7, 2013 at 1:23pmDude.

Stop violating the honor code.

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**EDXStudent**, Monday, March 11, 2013 at 12:59pmI help regulate the honor code by searching for keywords.

I'm allowed to do so.

It helps the staff @ edX, and maintains the integrity of the course.

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**EDXStudent**, Monday, March 11, 2013 at 1:02pmAnd anyways, I already finished the problem set.

So what is there for me to gain from searching for answers?

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**EDXProfessor**, Wednesday, March 13, 2013 at 2:22amHere is an idea, not the answer:

S[i] = 5*Xr[i] - 1*Xw[i], where S[i] is Score, Xr[i] - right answer and Xw[i] - wrong answer for the i-th student

The key here is to remember that there are exactly 10 questions each student answers, so Xw[i] = 10 - Xr[i]

Which gives us the following affine transformation:

S[i] = 6*Xw[i] - 10

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