Stats help - Binomial distribution?

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  1. fdsa212's Avatar
    1 09-05-2012  08:06
    • New Member
    • Posts: 11
    Stats help - Binomial distribution?
    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!
  2. steve2005's Avatar
    2 09-05-2012  11:03
    • TSR Demigod
    • Location: LONDON
    Re: Stats help - Binomial distribution?
    (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.
  3. the bear's Avatar
    3 09-05-2012  13:01
    • TSR Demigod
    • Location: Linton Travel Tavern
    • Posts: 7,190
    Re: Stats help - Binomial distribution?
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