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Math Help - SD and Normal Approximation

  1. #1
    Yan
    Yan is offline
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    Please Help Me!!! it's due tomorrow !!! SD and Normal Approximation

    Let A1, A2, and A3 be events with probabilities 1/5, 1/4, and 1/3, respectively. Let N be the number of these events that occur.

    a) Write down a formula for N in terms of indicators.
    b) Find E(N)

    In each of the following cases, calculate Var(N):
    c) A1, A2, A3 are disjoint;
    d)they are independent;
    e) A1 is a subset of A2 is subset of A3.
    Last edited by Yan; November 3rd 2008 at 12:30 PM.
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