November 25, 2015

Homework Help: Intro to probability

Posted by amelie on Saturday, February 23, 2008 at 9:52pm.

Two balanced coins are tossed. What are the expected value and the variance of the number of heads observed?
I'm confused on how to start. I don't know how many times im suppose to toss coin, and how to set up my table for the expected value and then find variance, I know how to find expected value when I know how to use what's given to me, hope you can help. I feel that the answer is probably simple but i'm stuck on info i think it lacks.

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