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    Variance and the Standard Deviation

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    In San Francisco, 30% of workers take public transportation daily.
    a) In a sample of 10 workers, what is the probability that exactly three workers take the public transport daily? [Hint: It is a Binomial Distribution Problem.]

    f(3) =

    b) In a sample of 10 workers, what is the probability that at least three workers take the public transport daily?

    P(x?3)=1-f(0)- f(1)- f(2)
    f(0) =
    f(1) =
    f(2) =
    P(x?3)=1-f(0)- f(1)- f(2) =

    c) How many workers are expected to take the public transportation daily?

    E(X) =

    d) Compute the variance and the standard deviation of the number of workers that will take the public transport daily.

    Var(X) =
    Standard Deviation =

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