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Thread: Difference between mean and expected value

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    Difference between mean and expected value




    Could someone please explain as simply as possible the difference between mean and expected value?

    Here is my problem: This is for my math stats class. I have read the textbook and done several of the problems in the probability distributions chapter. I understand how it works, basically (or at least, I know how to use it).

    Where I'm stuck is that in the instructions for the project I have do, the instructor uses the term "mean" for a discrete probability distribution problem. (It is a comparison of the population and a sample we create on our own - at least I think that's what it is. All the possible outcomes vs. the outcomes I got.) Example: "Find the mean and standard deviation of this discrete random variable." Is it normal to just use the terms interchangeably?

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    Re: Difference between mean and expected value

    Yes they do get used interchangeably by some people.
    I don't have emotions and sometimes that makes me very sad.

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    Re: Difference between mean and expected value


    Okay, that helps a bit, thanks. I think I'm still doing something wrong but I can't figure it out with her using "mean" the whole time.

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