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Stats help - Binomial distribution?

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    Suppose a probability that a certain experiment will be successful is .4 - and let X denote the number of successes that are obtained in 15 independent performances of the experiment.

    a. What is E(X)?
    b. What is the Var(X)?
    Find Pr(6≤X≤9)?

    THanks in advance!
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    (Original post by fdsa212)
    Suppose a probability that a certain experiment will be successful is .4 - and let X denote the number of successes that are obtained in 15 independent performances of the experiment.

    a. What is E(X)?
    b. What is the Var(X)?
    Find Pr(6≤X≤9)?

    THanks in advance!
    You expect us to do your work!

    Why are you using Pr, surely you should use capital P.
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    www.youtube.com/watch?v=CD9IY3EQH-k

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