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Média e variação de uma variável aleatória binomial

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    Torben Mark O.
    DE
    Torben Mark O.

    In solution 12 there is a mistake and I don't know if I'm right with my idea in terms of corrrection of this mistake. If X~Bi(12, 0.74) then Var(X)=12 x 0,74 x 0,25 = 2,22 and stdev(X)=√2,22=(2,22)^(0,5)=1,4899664426≈1,49(≈1,5 ?). In the modul there is follwing calculcation: If X~Bi(12, 0.74) then Var(X)=12 x 0,75 x 0,25 = 2,22 ... =>X~Bi(n;p)=> n=12 and p=0,74 => X~Bi(12; 0.74) => Var(X)=n x p x (1-p) = 12 x 0,75 x 0,25 but p is 0.74 and not 0.75. Could it be that 9/12=0.75 and the mistake is the first at X~Bi(n;p) where p = 0,74? The mistake goes through the follwing calculation to the end of the solution.

    Henock A.
    ET
    Henock A.

    done

    Juliet N.
    NG
    Juliet N.

    not clear

    Juliet N.
    NG
    Juliet N.

    Mean and variance of a binomial random variable

    Rachel N.
    IE
    Rachel N.

    The mean and variance of a binomial random variable

    Jahidul I.
    BD
    Jahidul I.

    Mean and Variance of Binomial Random Variables The probability function for a binomial random variable is b ( x ; n,p ) =

    Jahidul I.
    BD
    Jahidul I.

    what is the Binomial Random Variables ?

    Selman R.
    BA
    Selman R.

    Mean = p; variance = p*q

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