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What is the mean and variance of X?

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  • #51818

    Tig
    Member

    I am double checking my work.
    Does nay one know what the following would be?
    In a survey,85% of voters support referendum.If 10 voters are chosen at random,and X is the number of voters that support this referendum, find the mean and variance of X?

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    #180834

    Van Loon
    Participant

    X~B(n,p)
    E(X)=np
    V(X)=npq

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    #180835

    Tig
    Member

    In a survey,85% of voters support referendum.If 10 voters are chosen at random,and X is the number of voters that support this referendum, find the mean and variance of X?

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    #180837

    Darth
    Participant

    TIG, START DOING YOUR OWN HOMEWORK AND STOP POSTING YOUR HOMEWORK QUESTIONS HERE!! THERE IS SOMETHING INHERENTLY DISHONEST ABOUT HAVING OTHERS DO YOUR HOMEWORK. START STUDYING!!!!!

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    #180839

    Tig
    Member

    I already did it. I was just checking to see if I am correct.

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    #180841

    Darth
    Participant

    Yeah, I’m sure. How about next time you post your answer and then get confirmation.

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    #180845

    Helper
    Participant

    The binomial distribution has the following properties:

    The mean of the distribution (ìx) is equal to n * P .
    The variance (ó2x) is n * P * ( 1 – P ).
    The standard deviation (óx) is sqrt[ n * P * ( 1 – P ) ].

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    #180846

    Tig
    Member

    The answer I had was mean 8.5 and variance was 1.275
    I do not think this was correct. Is there another one you would like me to post my answer to?
    I never had statistics in my life and this is only my 4 time in the class
    so I would like to know I am on the right page.
    I have no one to help me so that is why I was looking for help. I think I am in wrong place.

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    #180848

    Darth
    Participant

    I don’t mean to be harsh with you and I feel badly that you may not have resources where ever you are but if we answered ever post from a student not able to do his/her homework this site would be full of such things. This site was founded to exchange information regarding Lean Six Sigma and not as a tutoring site for students. Here is the stated purpose of the Forum:This discussion forum covers the full range of Six Sigma Quality discourse and provides a fascinating look at evolving viewpoints, debate and advice on every subject from performing a 2 sample t-test to leading a Six Sigma deployment.

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    #180849

    Darth
    Participant

    And yes, according to the help provided by Helper, your answer is correct.

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